Basal Ones Research Articles

Selection rules in the excitation of the divacancy and the nitrogen-vacancy pair in 4 H - and 6 H -SiC

In this study, we address selection rules with respect to the polarization of the optical excitation of two color centers in 4H−SiC and 6H−SiC with potential for applications in quantum technology, the divacancy and the nitrogen-vacancy pair. We show that the photoluminescence of the axial configurations of higher symmetry (C3v) than the basal ones (C1h) can be canceled using any excitation (resonant or nonresonant) with polarization parallel to the crystal axis (EL||c). The polarization selection rules are determined using group-theoretical analysis and simple physical arguments showing that phonon-assisted absorption with EL||c is prohibited despite being formally allowed by group theory. A comparison with the selection rules for the silicon vacancy, another defect with C3v symmetry, is also carried out. Using the selection rules, we demonstrate selective excitation of only one basal divacancy configuration in 4H−SiC, the PL3 line, and discuss the higher contrast and increased Debye-Waller factor in the selectively excited spectrum. Published by the American Physical Society 2024

Environmental and seed-position effects on viability and germination of buried seeds of an invasive diaspore-heteromorphic annual grass.

Environmental factors, such as temperature and moisture, and plant factors, such as seed position on the mother plant, can affect seed viability and germination. However, little is known about the viability and germination of seeds in different positions on the mother plant after burial in soil under natural environmental conditions. Here, diaspores from three positions on a compound spike and seeds from two/three positions in a diaspore of the invasive diaspore-heteromorphic annual grass Aegilops tauschii were buried at four depths for more than 2 years (1-26 months) under natural conditions and viability and germination monitored monthly. Viability of seeds in each diaspore/seed position decreased as burial depth and duration increased and was associated with changes in soil temperature and moisture. Germination was highest at 2 cm and lowest at 10 cm soil depths, with peaks and valleys in autumn/spring and winter/summer, respectively. Overall, seeds in distal diaspore and distal seed positions had higher germination percentages than those in basal diaspore and basal seed positions, but basal ones lived longer than distal ones. Chemical content of fresh diaspores/seeds was related to diaspore/seed position effects on seed germination and viability during burial. We conclude that seeds in distal diaspores/seed positions have a 'high risk' strategy and those in basal positions a 'low risk' strategy. The two risk strategies may act as a bet-hedging strategy that spreads risks of germination failure in the soil seed bank over time, thereby facilitating the survival and invasiveness of A. tauschii.

Movement disorders associated with neurological tumors

Neurological tumors, such as gliomas and meningiomas are rarely presented by movement disorders. Early detection of neurological tumors, both basal ganglia arising tumors and basal ganglia-sparing ones, presenting with movement disorders is crucial to prevent any further deficits.

Several types of triangle zones from the Subandean ranges of Peru: Fish-tails, tectonic wedges and passive-roof duplexes

Surface geology, well data and 2D seismic interpretations reveal the presence of triangle zone structures at the contact of the Subandean Ranges and the Amazonian foreland in Peru. From north to south the Santiago, Marañon, Ucayali and Madre de Dios basins have been studied. Interpretations presented in this study show a great variety of structural styles at this contact area. Simple triangle zones with one back thrust, composite ones with several back thrusts, more complex double vergent ones with pop-up structures, best described as fish-tails, tectonic wedges and passive-roof duplexes are present in the study area. The role of pre-Andean tectonics and paleogeography is key to understanding the Andean evolution, due to the control on the location and geometry of the main detachment levels. The Santiago Basin is characterized by the presence of fish-tail structures with a Permian-Triassic evaporitic basal detachment located at the base of the Pucara Gr. At the Ucayali Basin, several detachment levels interact, the basal ones located within the Ordovician, Devonian, and Carboniferous defining triangle zones or tectonic wedges. At the Madre de Dios Basin, two detachment levels define the base of the triangle zone, Permian shales in the northwest at the Inambari Imbricates area, and Lower Devonian (Cabanillas Gr.) in the southeast at the Candamo area. A roof thrust is located within the Paleogene section at both the Madre de Dios and Ucayali basins, defining passive-roof duplex structures.Several detachment levels are rooted into the Lower Paleozoic; others within the Permian-Triassic section, being locally evaporitic, and finally others are located at the base of the Cretaceous. Paleozoic shales represent the main basal detachment level of the southern Subandean ranges. The role of these detachments and the role of the sedimentation rate are discussed as factors that control the development and geometry of the triangle zones described in the study area.Except for the San Martin-Sagari area of the Ucayali Basin, the triangle zones of the Santiago and Madre de Dios basins remain unexplored even though active petroleum systems are present. Sub-thrust structures at the Azulmayo area of the Madre de Dios Basin remain promising undrilled structures.

Integrated molecular and pharmacological characterization of patient-derived xenografts from bladder and ureteral cancers identifies new potential therapies.

BackgroundMuscle-invasive bladder cancer (MIBC) and upper urinary tract urothelial carcinoma (UTUC) are molecularly heterogeneous. Despite chemotherapies, immunotherapies, or anti-fibroblast growth factor receptor (FGFR) treatments, these tumors are still of a poor outcome. Our objective was to develop a bank of patient-derived xenografts (PDXs) recapitulating the molecular heterogeneity of MIBC and UTUC, to facilitate the preclinical identification of therapies.MethodsFresh tumors were obtained from patients and subcutaneously engrafted into immune-compromised mice. Patient tumors and matched PDXs were compared regarding histopathology, transcriptomic (microarrays), and genomic profiles [targeted Next-Generation Sequencing (NGS)]. Several PDXs were treated with chemotherapy (cisplatin/gemcitabine) or targeted therapies [FGFR and epidermal growth factor (EGFR) inhibitors].ResultsA total of 31 PDXs were established from 1 non-MIBC, 25 MIBC, and 5 upper urinary tract tumors, including 28 urothelial (UC) and 3 squamous cell carcinomas (SCCs). Integrated genomic and transcriptomic profiling identified the PDXs of three different consensus molecular subtypes [basal/squamous (Ba/Sq), luminal papillary, and luminal unstable] and included FGFR3-mutated PDXs. High histological and genomic concordance was found between matched patient tumor/PDX. Discordance in molecular subtypes, such as a Ba/Sq patient tumor giving rise to a luminal papillary PDX, was observed (n=5) at molecular and histological levels. Ten models were treated with cisplatin-based chemotherapy, and we did not observe any association between subtypes and the response. Of the three Ba/Sq models treated with anti-EGFR therapy, two models were sensitive, and one model, of the sarcomatoid variant, was resistant. The treatment of three FGFR3-mutant PDXs with combined FGFR/EGFR inhibitors was more efficient than anti-FGFR3 treatment alone.ConclusionsWe developed preclinical PDX models that recapitulate the molecular heterogeneity of MIBCs and UTUC, including actionable mutations, which will represent an essential tool in therapy development. The pharmacological characterization of the PDXs suggested that the upper urinary tract and MIBCs, not only UC but also SCC, with similar molecular characteristics could benefit from the same treatments including anti-FGFR for FGFR3-mutated tumors and anti-EGFR for basal ones and showed a benefit for combined FGFR/EGFR inhibition in FGFR3-mutant PDXs, compared to FGFR inhibition alone.

The Adipokinetic Peptides of Hemiptera: Structure, Function, and Evolutionary Trends.

The Hemiptera comprise the most species-rich order of the hemimetabolous insects. Members of a number of superfamilies, most notably especially the more basal ones such as white flies, psyllids and aphids, belong to the most destructive agricultural insects known worldwide. At the other end of the phylogenetic tree are hemipterans that are notorious medical pests (e.g. kissing bugs). Most of the hemipteran species are good flyers, and lipid oxidation plays a pivotal role to power the contraction of flight muscles and, in aquatic water bugs, also deliver the ATP for the extensive swimming action of the leg muscles. Mobilization of stored lipids (mostly triacylglycerols in the fat body) to circulating diacylglycerols in the hemolymph is regulated by a set of small neuropeptides, the adipokinetic hormones (AKHs). We searched the literature and publicly available databases of transcriptomes and genomes to present here AKH sequences from 191 hemipteran species. Only few of these peptides were sequenced via Edman degradation or mass spectrometry, and even fewer were characterized with molecular biology methods; thus, the majority of the AKHs we have identified by bioinformatics are merely predicted sequences at this stage. Nonetheless, a total of 42 AKH primary sequences are assigned to Hemiptera. About 50% of these structures occur also in other insect orders, while the remaining 50% are currently unique for Hemiptera. We find 9 novel AKHs not shown to be synthesized before in any insect. Most of the hemipteran AKHs are octapeptides (28) but there is an impressive number of decapeptides (12) compared to other speciose orders such as Diptera and Lepidoptera. We attempt to construct a hypothetical molecular peptide evolution of hemipteran AKHs and find quite a bit of overlapping with current phylogenetic ideas of the Hemiptera. Lastly, we discuss the possibility to use the sequence of the aphid AKH as lead peptide for the research into a peptide mimetic fulfilling criteria of a green insecticide.

A new species and a new record of the genus Otostigmus Porat, 1876 (Chilopoda: Scolopendromorpha: Scolopendridae) in Vietnam.

Otostigmus consonensis sp. nov. was described from Vietnam, and O. sulcipes Verhoeff, 1937 was recorded for the first time in this country. The new species can be recognized by having 18 antennomeres including 2.32.5 glabrous basal ones, three coxosternal teeth, tergites 520 with complete paramedia sutures, sternites with incomplete paramedian sutures, and the ultimate leg with 1115 prefemoral spines. The fragment of the COI gene was extracted for each species; thus, a new species and a record of O. sulcipes were supported by the COI genetic distances and the corresponding phylogenetic analysis.

Inibidor da biossíntese de giberelinas em pimenteiras ornamentais

ABSTRACT The objective of this study was to evaluate whether the inhibition of gibberellin biosynthesis affects the morphophysiological traits of potted ornamental Capsicum baccatum and Capsicum annuum growing under shade house conditions. Plants maintained in 2.7 L pots were arranged in a completely randomized design in a 2x4 factorial consisting of two pepper cultivars Chapéu-de-frade (C. baccatum) and Vulcão (C. annuum) and four paclobutrazol (PBZ) concentrations (0, 25, 50, and 75 mg L-1) with four replicates. At 30, 45, and 60 days after treatment, the plants were analyzed, and data were submitted to the analysis of general and regression variance. Gibberellin biosynthesis inhibition affected the morphophysiological and biochemical evaluations. For most evaluated traits, no interaction between factors was observed, suggesting that both pepper cultivars had a similar response to the growth regulator. PBZ-induced inhibition of gibberellin biosynthesis improved plant water status, which enhanced the vigor of potted pepper plants. The dramatic reduction of upper leaves promoted by plant growth regulators compared to basal ones negatively impacted the visual ornamental aspect of Chapéu-de-frade peppers.

Number and Relative Proportions of Eusperm and Parasperm in Various Lepidoptera

Lepidoptera produce two kinds of sperm, eusperm, which are conventional nucleated spermatozoa, and parasperm, which lack nuclei and are usually smaller. Both travel in the female to the sperm storage organ, the spermatheca, but there the parasperm become inactive or disappear without taking any direct role in fertilization of the eggs. There are widespread accounts in the literature of an excess of parasperm over eusperm, though relatively few actual counts, and those counts are from various locations in the lifetime of the sperm: from testes, seminal vesicles, ejaculates, or spermathecae. With phylogenetic comparisons in mind, we counted sperm in the final sperm storage organs of males, the seminal vesicles (ductus ejaculatorius duplex), to explore the prevalence of these two types of sperm over a wide range of species and sizes. We found parasperm in all species, including the most phylogenetically basal (non-ditrysian) ones, and a preponderance of parasperm over eusperm in almost all, including a majority of the smaller species with small total numbers of sperm. Total sperm number of both types increased with wingspan (our proxy for size) as did the ratio of parasperm to eusperm. The ubiquity of parasperm and their preponderance even in very small species indicates an important role in lepidopteran reproduction. Further, the large numbers of both sperm types in larger species of Lepidoptera, apparently vastly more than are needed to fertilize eggs, suggests a role in sperm competition.

The impact of surgical masks on the nasal function in the COVID-19 era

Background The Covid-19 pandemics has obliged to using different types of personal protective devices (PPD) for a prolonged time of the day, especially in the Health Centers, with preference of surgical masks (SM) during the first pandemic waves. Aims/Objectives This study was designed to assess the eventual changes of the nasal respiratory condition during continuous SM wearing. Material and methods Fourteen healthcare professionals filled a visual analogue scale (VAS) questionnaire for the detection of eventual nasal breathing impairment or symptoms. Nasal resistance and flow values were obtained via the active anterior rhinomanometry (AAR) that was performed under the basal condition, as well as immediately after wearing the surgical mask (SM) and 3 h after its continuous use. Results The increase of inspiratory resistance was significantly correlated to the reduction of the maximum flux, when comparing SM parameters to the basal ones (r = –0.70, p < .05). At VAS evaluation, SM wearing showed to induce itching in 70% of the subjects, nasal dryness in 55%, nasal blockage in 50%, headache in 39%, watery nasal discharge in 20% and sneezing in 18%. Conclusions and significance The SMs do not induce evident physiological variations of the nasal function due to a compensatory respiratory mechanism that, despite a progressive increase of nasal resistances, is not inducing significant changes of the nasal fluxes.

MP22-15 ARE UROLOGISTS READY FOR INTERPRETATION OF MULTIPARAMETRIC MRI FINDINGS? A PROSPECTIVE MULTICENTRIC EVALUATION

MP22-15 ARE UROLOGISTS READY FOR INTERPRETATION OF MULTIPARAMETRIC MRI FINDINGS? A PROSPECTIVE MULTICENTRIC EVALUATION

Impact of atrial septal defect device size on biventricular global and regional function: a two-dimensional strain echocardiographic study.

In this study, we assessed the acute changes in biventricular longitudinal strain after atrial septal defect transcatheter closure and its relation to the device size. Hundred atrial septal defect patients and 40 age-matched controls were included. Echocardiography and strain study were performed at baseline and 24 hours and 1 month after the intervention. The study group was divided into two subgroups; group 1: smaller devices were used (mean device size = 1.61 ± 0.05 cm, n = 74) and group 2: larger devices were used (mean device size = 2.95 ± 0.07 cm, n = 26). At baseline, there was a significant difference between the study group and controls as regards right ventricular global longitudinal strain with significant hyperkinetic apex (p = 0.033, p = 0.020, respectively). There was a significant immediate reduction in right ventricular global longitudinal strain (from -24.43 ± 0.49% to -21.62 ± 0.47%, p < 0.001), which showed insignificant improvement after 1-month follow-up. While only left ventricular global longitudinal strain increased after 1 month. Within 24 hours of device closure, all the basal- and mid-lateral segments strains and apical right ventricular strains showed a significant reduction. There was a significant negative correlation between the indexed large device size and an immediate change in the right ventricular global longitudinal strain (r = -0.425, p = 0.034). Significant right ventricular global longitudinal strain reduction starts as early as 24 hours after transcatheter closure, irrespective of the device size used. The rapid impact of closure was mainly on the biventricular basal and lateral segments and right ventricular apical ones, especially with the large sized atrial septal defect.

Anti-tumor effect of trametinib in bladder cancer organoid and the underlying mechanism

ABSTRACT Bladder cancer (BC), a main neoplasm of urinary tract, is usually inoperable and unresponsive to chemotherapy. As a novel experimental model for muscle-invasive BC, we previously established a culture method of dog BC organoids. In the present study, the detailed in vitro and in vivo anti‐tumor effects of trametinib were investigated by using this model. In each BC organoid strain, epidermal growth factor receptor (EGFR)/ERK signaling was upregulated compared with normal bladder cells. Trametinib even at a low concentration inhibited the cell viability of BC organoids and the activation of ERK through decreasing expression of c-Myc, ELK1, SIK1, and PLA2G4A. Trametinib arrested cell cycle of BC with few apoptosis. Dual treatment of BC organoids with trametinib and YAP inhibitor, verteporfin extremely inhibited the cell viability with apoptosis induction. Moreover, trametinib induced basal to luminal differentiation of BC organoids by upregulating luminal markers and downregulating basal ones. In vivo, trametinib decreased the tumor growth of BC organoids in mice and the xenograft-derived organoids from trametinib-administered mice showed enhanced sensitivity to carboplatin due to MSH2 upregulation. Our data suggested a new strategy of trametinib-YAP inhibitor or trametinib-carboplatin combination as a promising treatment of BC.

Identification and Quantification of Bioactive Compounds in Agave potatorum Zucc. Leaves at Different Stages of Development and a Preliminary Biological Assay

The leaves of Agave potatorum Zucc. represent more than 50% of waste during the jima in the mezcal industry. To provide the basis for a knowledge-based integral use of these wastes, this research provides the identification and quantification of bioactive compounds of leaves at different stages of development, differentiated by the position of the leaves in the plant (basal, medium and apical), and dividing each leaf into apical and basal parts. Qualitative phytochemical analysis showed highly positive results for coumarins and tannins, and positive for cardiac glycosides and triterpenoids compounds, without an age-dependent or position of the leaves response of the plant. Quantitative analysis of phenolic compounds and flavonoids is not preferentially accumulated respect to the position of the leaf in the plant, only are higher in the apical parts, whereas for carbohydrates a positive gradient was evidenced through the leaves in the plant from apical to basal ones. The highest concentration of phenolics, flavonoids, fructose and fructans compounds were determined in 6-year leaves, with maximum observed values of 173.80 ± 9.36, 35.58 ± 6.41, 308.30 ± 3.62 mg/g d.w., and 37.23 ± 4.5%, respectively. Interestingly, the ethanolic extract of the fresh leaves of A. potatorum showed an increase in the mycelial growth of Botrytis cinerea. The data showed that plant age is the most important factor influencing the content of bioactive compounds. In addition, a fungal growth enhancing effect was exhibited by the extract, suggesting a biotechnological advantage that can improve the growth of beneficial fungi in agricultural crops.

Una especie nueva de Sisyrinchium (Iridaceae: Iridioideae) de San Luis Potosí, México

A new species of Sisyrinchium, endemic to the state of San Luis Potosi, Mexico, is described and illustrated. Sisyrinchium anarosae is distinguished from other Mexican taxa of section Echthronema by its decumbent, branched floral stem, in which the first nodes of the primary axis develop leaves with similar features to the basal ones, which in contact with the substrate produce roots, functioning as vegetative propagation structures, and by its inflorescence with 2 to 12 terminal rhipidia, with 2 to 4 flowers each. The description of this taxon increases to 45 the number of species of the genus that inhabit Mexico.

New species of the genera Cranae and Lucretilis (Orthoptera: Acrididae) from Indonesia with taxonomic notes on the tribe Cranaeini

Three species are described from Indonesia, namely Cranae lolobatensis sp. nov. (Halmahera Island), C. ferwillemsei sp. nov. (New Guinea Island) and Lucretilis balikpapan sp. nov. (Borneo Island = Kalimantan). Position of the genera Lucretilis Stål, 1878 and Cranae Stål, 1878 in the modern classification of grasshoppers is discussed. First genus belongs to the nominative tribe of the subfamily Oxyinae. The genera Cranae, Cranaella Ramme, 1941, Craneopsis C. Willemse, 1933, Opiptacris Walker, 1870, Paracranae C. Willemse, 1931, Phalaca I. Bolívar, 1906, Philicranae C. Willemse, 1955 are placed in the tribe Cranaeini Brunner von Wattenwyl, 1893, stat. resurr. This tribe is transferred here from Oxyinae to the subfamily Hemiacridinae based on following characters: ventral genicular lobes of hind femora without spine; epiphallus bridge-like, not divided into two symmetric halves; zygoma apically with deep excision; valves of penis completely divided into basal and apical ones, and flexure between them absent.

INFLUENCE OF ROOTING MEDIA AND INDOLE-3-BUTYRIC ACID (IBA) CONCENTRATION ON ROOTING AND GROWTH OF DIFFERENT TYPES OF CONOCARPUS ERECTUS L. STEM CUTTINGS

The present study was conducted to evaluate the influence of rooting media (clay, peat moss + sand, peat moss + perlite and vermiculite), cutting types (tip, middle and basal) and different concentrations of indole-3-butyric acid (control, 50, 100 and 200 ppm IBA) on the rooting and growth of Conocarpus erectus L. stem cuttings. The experiment was laid out in a split-split-plot design, with three replicates. The obtained results showed that vermiculite was the best rooting medium used for improving the rooting percentage, root number, root length, stem length, branch number and leaf number per rooted cutting, followed by peat + perlite (1:1 in v/v) and peat + sand (1:1 in v/v), respectively comparing with clay soil which recorded the lowest values. The tip cutting was superior to the middle and basal ones in all rooting media used, especially in vermiculite medium. Among IBA concentrations used, cuttings treated with IBA at 100 ppm produced significantly better rooting (42.9%) than 50 ppm (36.3%), 200 ppm (36.0%) and untreated cuttings (23.1%). The greatest rooting percentage (95.0%) and the best root and growth characteristics as well as the highest endogenous contents of phenols, indole acetic acid (IAA) and the lowest abscisic acid (ABA) contents were obtained from tip cuttings treated with IBA at 100 ppm and planted in vermiculite substrate. Moreover, the combined treatment of 100 ppm IBA and vermiculite substrate significantly improved the rooting percentage, root and growth measurements of middle and basal cuttings as well as gave the highest C/N ratio in basal cutting tissues compared to the same cutting types combined with the other rooting media and IBA concentrations. Hence, it could be recommended to treat the different types of C. erectus stem cuttings with IBA at 100 ppm and planting in vermiculite medium for improving rooting, quality and growth of cuttings.

Improvement of the 10-Year Atherosclerotic Cardiovascular Disease (ASCVD) Risk Following Bariatric Surgery.

Several studies have shown improvement in cardiometabolic risk factors, as well as in the related mortality following bariatric surgery. However, few studies have assessed changes in the estimated cardiovascular risk. The aim of the present study was to investigate the effect of bariatric surgery on the estimated 10-year atherosclerotic cardiovascular disease (ASCVD) risk. We performed a retrospective analysis from a prospectively maintained database of patients who underwent a primary bariatric procedure from 2004 to 2018. The 10-year ASCVD risk was estimated before and after 1year of surgery using the ASCVD Risk Estimator Plus of the American College of Cardiology. Changes in the ASCVD risk were evaluated. There were 58 (51.3%) women and 55 (48.7%) men with a mean age of 49.9years. Before surgery, 64 patients had arterial hypertension, 57 T2DM, and 49 were smokers. Baseline mean estimated 10-year ASCVD risk was 8.50 ± 7.92%. Fifty-one (45.1%), 10 (8.8%), 41 (36.3%), and 11 (9.7%) patients were classified as low, borderline, intermediate, and high risk, respectively. One year after surgery, 92.9% of the patients showed a reduction of the estimated 10-year ASCVD risk. Mean values were significantly lower (5.31 ± 5.95%) when compared to basal ones (p < 0.0001). According to the risk classification, 71 (62.8%), 13 (11.5%), 26 (23%), and 3 (2.7%) were cataloged as low, borderline, intermediate, and high risk, respectively. Surgically induced weight loss leads to a significant improvement in the estimated 10-year ASCVD risk, 1year after surgery.

IMPROVING ROOTING AND GROWTH OF CONOCARPUS ERECTUS STEM CUTTINGS USING INDOLE-3-BUTYRIC ACID (IBA) AND SOME BIOSTIMULANTS

The current study was conducted to evaluate the effects of indole-3-butyric acid (IBA) at 100 ppm with or without biostimulants (Agrobacterium rhizogenes, seaweed extract and coconut water) as either a spray or drench for 3 minutes or 1 hour on rooting and growth parameters of three cutting types (tip, middle and basal) of Conocarpus erectus L. The data showed that the rooting percentage, root and vegetative characteristics of rooted cuttings were significantly increased by all treatments of IBA and/or biostimulants compared to the untreated cuttings. The individual treatments of seaweed extract and coconut water were more effective than IBA or A. rhizogenes alone. Seaweed extract as drench with or without IBA surpassed those of seaweed extract treatments as spray. Besides, the response of cuttings treated with coconut water for 1 hour was better than coconut water for 3 min. Tip cuttings were significantly better than the middle and basal ones, especially in relation to rootability of cuttings. Maximum rooting percentage and shoot characteristicsof plants were obtained from tip cuttings treated with IBA + coconut water for 1 hour, followed by IBA + seaweed extract as drench. The highest rooting percentage was associated with high endogenous levels of phenols, indole acetic acid (IAA) and gibberellic acid (GA) as well as the lowest abscisic acid (ABA) level in cutting tissues and the anatomical structure of rooted cuttings. So, it can be recommended treating tip cuttings of C. erectus with either coconut water for 1 hour or seaweed extract as drench combined with IBA for enhancing the rooting percentage, root and shoot growth parameters as well as content of endogenous root promoting substances.

Poa magellensis (Poaceae), a new species from Central Apennine (Italy).

A new species, Poa magellensissp. nov., is described and illustrated based on collections from the Majella Mountains in Central Apennine, Italy. It is morphologically similar to P. ligulata Boiss., but can be distinguished by green leaves, the basal ones adaxially lightly scabrous or sparsely hairy, longer ligules particularly in the upper leaves, panicles denser with primary branches sub-erect to erect, glumes with broader scarious margin, more acute glumes and lemmas, lemmas and paleas longer, rachilla hairy, calluses usually with a crown of hairs or shortly webbed, caryopses longer. A distribution map of the species is also presented.