Ordinary Epidermal Cells Research Articles

Morphoanatomical and histochemical investigation of Monteverdia evonymoides (Reissek) Biral

Monteverdia species are known for their medicinal properties. However, due to similarities between species, the accurate identification of different species can be cumbersome. The study of morphoanatomy can contribute to the authentication of the species by providing additional information and contributing to the species characterization. Therefore, this work presents the morphoanatomy of the leaves and stems of Monteverdia evonymoides (Reissek) Biral analyzed by optical microscopy, scanning electron microscopy, and histochemical approaches. Through these methods, we were able to determine, morphologically, the analyzed species features large and woody trees; its leaves are simple, distichous, and entire; the leaf margins are fringed; the stipules are caducous, triangular, and rarely persistent; the apex can vary from acute to obtuse, and the leaf blade has no trichomes. The frontal view presents polygonal epidermal cells, anomocytic, anisocytic, and tetracytic stomata that are found on the abaxial surface and are positioned at the same level as the ordinary epidermal cells; the epidermis is uniseriate and covered with a thick cuticle; the mesophyll is dorsiventral; the midrib is biconvex, and below the epidermis is the angular collenchyma, with one collateral bundle in an open arc and two dorsal bundles; in the ground parenchyma, there is a small collateral vascular bundle, with fibers juxtaposed to the phloem. Histochemical reactions were positive for lipophilic, phenolic, and lignified compounds. Among the observed characteristics, the stomatal classification of the leaf and the prominence of the midrib (adaxial surface) in this study help to identify M. evonymoides and may contribute to species taxonomy by comparing it with other species of the genus and quality control studies.

Austropuccinia psidii infection changes stomatal dynamics and leaf gas exchange of guava leaves: A physio-histopathological assessment

This study aimed to characterise the life cycle of Austropuccinia psidii, the causal agent of myrtle rust, in guava cv. Paluma and to determine how this pathogen affects gas exchange in diseased leaves. The pathogen formed appressoria on ordinary epidermal cells and intercellular hyphae and intracellular branched lobe-shaped haustoria in parenchyma cells. In the stem, hyphae grew in the cortical region and crossed between tracheary cells, reaching the medullary region. In the leaf, hyphae colonised the intercellular spaces of the main vein and mesophyll and the substomatal chamber. Colonisation of the substomatal chamber by A. psidii changed the stomatal dynamics and leaf gas exchange. The stomatal response to light was slower and had a smaller amplitude in diseased guava leaves. Consequently, impaired stomatal movement induced by A. psidii is an additional factor changing the performance of plants under abiotic stress.

An Accurate Phenotypic Study of The Foliar Epidermis for Some Species of Silene L. From Caryophyllaceae Family in Iraq

In the present research work, detailed micromorphological features study (investigated for foliar epidermal anatomy) for five species of the genus Silene L., belonging to the family Caryophyllaceae. One of the essential anatomical characteristics of the leaf in this genus observed two basic stomata types on both adaxial and abaxial epidermis, diacytic and anisocytic, from five species, three species have distinguished a diacytic type, exception two species S. chlorifolia and S. longipetala appeared to have both a diacytic and anisocytic, also has astrocytic crystals within epidermal cells. Also in the present work, 3 species out of 5 have trichomes on their both surfaces, observed having them multicellular uniseriate. All the taxa were the distinguished shape of the guard cells as reniform-like from a full short reniform in all species. So the general shape of ordinary epidermal cells, anticlinal wall of the epidermal cells, type of stomata cells, collar shape marginal of guard cells, and trichomes. Images enhanced the micromorphological characteristics under study. Information on the locations and dates of the collection was also confirmed. This study revealed that the micromorphological features of the family are taxonomically signi?cant in the accurate identi?cation of species.

F-Actin Organization and Epidermal Cell Morphogenesis in the Brown Alga Sargassum vulgare.

The ordinary epidermal cells of various vascular plants are characterized by wavy anticlinal wall contours. This feature has not yet been reported in multicellular algal species. Here, we found that, in the leaf-like blades of the brown alga Sargassum vulgare, epidermal cells exhibit prominent waviness. Initially, the small meristodermal cells exhibit straight anticlinal contour, which during their growth becomes wavy, in a pattern highly reminiscent of that found in land plants. Waviness is restricted close to the external periclinal wall, while at inner levels the anticlinal walls become thick and even. The mechanism behind this shape relies on cortical F-actin organization. Bundles of actin filaments are organized, extending under the external periclinal wall and connecting its junctions with the anticlinal walls, constituting an interconnected network. These bundles define the sites of local thickening deposition at the anticlinal/periclinal wall junctions. These thickenings are interconnected by cellulose microfibril extensions under the external periclinal wall. Apart from the wavy anticlinal contour, outward protrusions also arise on the external periclinal wall, thus the whole epidermis exhibits a quilted appearance. Apart from highlighting a new role for F-actin in cell shaping, the comparison of this morphogenetic mechanism to that of vascular plants reveals a case of evolutionary convergence among photosynthetic organisms.

Anatomical Study for Vegetative Organs of Pelargonium graveolens L.'Hér Cultivated in Iraq

The current investigation concluded an anatomical study of the cultivated species Pelargonium graveolens L. 'Hér belong to the Geraniaceae family and which cultivated as an ornamental plant, fresh specimen were collected from different region in Baghdad ,the study vegetative parts (leaf, stem and petiole) in details ,the upper and lower epidermis of leaf and epidermis of stem also studied, ordinary epidermal cells and stomatal complexes studied in term of shapes and dimensions ,the result showed that stomatal in leaf and stem is anomocytic type, the cross sections of the vegetative parts prepared by microtome and free hand sectioning. The tissues of these parts include the number and the type of layers and thickness of each one , the result showed the presence of druses crystals in parenchyma cells of the petiole, stem and leaf. Vistur type of this organs also studied and it comprises of glandular and non-glandular trichomes which occur in different types and lengths.

First data on coniferous leaves from the Middle Jurassic of the Belgorod Region, Russia

Data on fossil coniferous leaves from the Middle Jurassic of the Stoilensky open mine in the Belgorod Region, Russia were obtained for the first time. These conifers are represented by the leaves of Mirovia, Podocarpophyllum, Elatocladus and Pityophyllum. A new species, Mirovia oskolica, sp. nov., is described based on the study of the morphology and epidermal features. Leaves of this species are characterized by the presence of thick resin ducts, stomata arranged in one stomatal zone, the short epidermal cells of the adaxial leaf side, the absence of papillae on the ordinary epidermal cells, and the rare presence of small proximal papillae on some subsidiary cells of the stomata. In addition, we have found leaves similar to the type leaves of M. eximia from the Middle Jurassic of the Kursk Region, Russia. We determine linear leaf fragments with longitudinally orientated stomata arranged in two stomatal bands and with narrow guard cells as Podocarpophyllum kazachstanicum, originally described from the Lower Jurassic of Kazakhstan. Besides these remains, there are numerous fragments of the narrower linear leaves with an acute apex, two stomatal bands and a very thin cuticle. These leaves are assigned to Pityophyllum sp. The only found sessile lanceolate leaf and several dispersed cuticle fragments with obliquely to transversely oriented stomata in the stomatal bands are determined as Elatocladus sp.

ON THE POSSIBILITY OF INFLUENCE OF CELL SURFACE RELIEF ON STOMATAL MOVEMENTS

Folds are often present on the surface of stomatal complex cells. This allows us to assume that the folds influence stomatal movements. To evaluate the validity of this assumption, the stomatal complexes with various surface reliefs of their cells were studied, namely the complexes with lateral folds, with marginal stomatal rings, with rings of ledges, with peristomatal rims, as well as those with folds located on subsidiary and ordinary epidermal cells without any obvious order, in Acokanthera oblongifolia, Acokanthera oppositifolia, Prunus laurocerasus, Populus tremula, Osmanthus yunnanensis, Raphiolepis ×delacourii, and Ternstroemia gymnanthera. In all the studied species, stomatal deformations depending on the presence of microrelief folds were observed. Since deformation processes are the basis of stomatal movements, it is possible to conclude that surface folds of stomatal complex cells are structural features of these cells capable of influencing the mechanics of stomatal movements.

Double Puzzle: Morphogenesis of the Bi-Layered Leaf Adaxial Epidermis of Magnolia grandiflora.

Anticlinal ordinary epidermal cell wall waviness is a widespread feature found in the leaves of a variety of land plant species. However, it has not yet been encountered in leaves with multiple epidermides. Surprisingly, in Magnolia grandiflora leaves, ordinary epidermal cells in both layers of the bi-layered adaxial epidermis exhibit wavy anticlinal contour. During the development of the above cells, cortical microtubules are organized in anticlinally oriented bundles under the anticlinal walls, and radial arrays extending from the bundles at the edges of anticlinal and external periclinal walls, under the external periclinal walls. This microtubule pattern is followed by cell wall reinforcement with local thickenings, the cellulose microfibrils of which are parallel to the underlying microtubules. This specialized microtubule organization and concomitant cell wall reinforcement is initiated in the external epidermal layer, while hypodermis follows. The waviness pattern of each epidermal layer is unrelated to that of the other. The above findings are discussed in terms of morphogenetic mechanism induction and any implications in the functional significance of ordinary epidermal cell waviness.

Monocotyledon‐like Leaves from the Middle Jurassic of East Siberia (Russia)

AbstractLeaf fragments of Herbifolia antiqua A. Frolov et Enushchenko gen. et sp. nov. from the Middle Jurassic (Aalenian) of the Irkutsk Coal Basin (Eastern Siberia, Russia) are reported. The following features are characteristic of H. antiqua gen. et sp. nov.: the presence of leaf sheaths, linear smooth‐edged leaves with parallel venation, anastomoses between the veins, anomocytic stomata, rhomb‐shaped ordinary epidermal cells. Such a combination of characters is widespread in modern monocotyledonous plants and is absent in fossil and modern cryptogam and gymnosperms. Due to the lack of evidence of an enclosed ovule in H. antiqua gen. et sp. nov., we attribute it to a typological angiosperm, based on its unique leaf structure characteristic of monocotyledons. The leaf epidermal structure of Herbifolia gen. nov. is most similar to those of modern Asparagales and Liliales.

Molecular Phylogenetics and Trait Evolution in Stigmatodon (Bromeliaceae, Tillandsioideae), an Endemic Genus to Brazilian Rocky Outcrops

Abstract— The genus Stigmatodon occurs in vertical and bare granite slopes, typical of the inselbergs of the Brazilian Atlantic Forest. Here, we present the first broad phylogenetic analysis focused on Stigmatodon, sampling a total of 83 terminals, including 16 of the 20 species of the genus and the morphologically similar species of Vriesea. We conducted a phylogenetic analysis using two plastid markers (matK and rps16-trnK) and the nuclear gene PHYC to infer phylogenetic relationships and reconstruct ancestral states for ecological and morphological characters. Our results suggest the monophyly of Stigmatodon as originally circumscribed is only possible with the inclusion of morphologically and ecologically similar Vriesea species. In addition, the morphological and anatomical traits led us to propose a new circumscription for the genus, combining eight species of Vriesea to Stigmatodon as S. andaraiensis, S. freicanecanus, S. lancifolius, S. limae, S. oliganthus, S. pseudoliganthus, S. vellozicolus, and S. zonatus. The stomata positioned above the ordinary epidermal cells, the adaxial water-storage parenchyma with axially elongated cells, the stamens positioned in two groups of three on each side of the corolla, and the tubo-laciniate stigma are exclusive to Stigmatodon in its new circumscription. These new morphological and phylogenetic results constitute a relevant contribution to the taxonomy and evolution of Bromeliaceae, one of the most diverse and ecologically important families of flowering plants of the Neotropics.

New findings of the female reproductive structures of Umaltolepis Krassilov and associated leaves of Pseudotorellia Florin in the Lower Cretaceous of Mongolia

Female reproductive structures of Umaltolepis are recorded in the Huhteeg (=Khukhtyk or Khukhteeg) Formation (Aptian–Albian) of the Baganuur coal mine (Central Mongolia) for the first time. These structures, preserved as dispersed cupules, are very similar to U. mongoliensis from the Tevshiin Govi Formation (Aptian–Albian) of the Tevshiin Govi locality in Central Mongolia. In the Baganuur locality, cupules of Umaltolepis were found in association with Pseudotorellia leaves, described here as a new species Pseudotorellia baganuriana, sp. nov. Leaves of this species are lanceolate, they are distinctive in the elongated epidermal cells of the adaxial leaf side similar across costal and intercostal zones, smooth periclinal walls of the ordinary epidermal cells, stomata arranged in bands on the abaxial leaf side, and the rare presence of small proximal papillae on some subsidiary cells of the stomata. Leaves of the new species differ considerably from the Pseudotorellia leaves associated with U. mongoliensis in the Tevshiin Govi locality. Despite this, we describe the Bagannur cupules as U. mongoliensis since we did not find any significant differences from the Tevshiin Govi material. Based on the updated species composition of Pseudotorellia in the Bureya Basin in Russia Far East (Nosova et al., 2021), we discuss here the type species Umaltolepis vachrameevii and associated leaves.

Rhabdotaenia – a typical Gondwanan leaf from the upper Permian of Jordan

Rhabdotaenia, a typical leaf type of Gondwana (e.g., India, Australia, Africa, South America) is described from the Umm Irna Formation (Permian) of the Dead Sea Region, Jordan. Two fragments with well-preserved cuticles were collected during fieldwork in 2017 from a single locality. They are characterized by a taeniopterid morphology and sparsely anastomosing veins. Veins arise from the rachis at acute angles of about 45°, immediately dichotomize and recurve slightly to run at about 80° to the rachis straight towards the margin, sporadically dichotomizing a second time and forming sparse anastomoses. Epifluorescence microscopy revealed that stomata are confined to intercostal fields and are haplocheilic with exposed guard cells surrounded by only poorly differentiated subsidiary cells. Ordinary epidermal cells are characterized by slightly sinuous cell walls within intercostal fields. The new material is the northernmost occurrence of this genus reported so far, well within the palaeoequatorial belt of Pangea. This occurrence highlights the floral relationship of some assemblages of the so called ‘mixed floras’ of the Arabian Peninsula with Gondwana, and demonstrates that the Umm Irna Formation, in particular, still holds great potential for future palaeobotanical discoveries. Patrick Blomenkemper [p_blom02@uni-muenster.de], Paläobotanik, Westfälische Wilhelms-Universität, Heisenbergstraße 2, 48149 Münster, Germany; Hans Kerp [kerp@uni-muenster.de], Paläobotanik, Westfälische Wilhelms-Universität, Heisenbergstraße 2, 48149 Münster, Germany; Abdalla Abu Hamad [abdalla80@hotmail.com], University of Jordan, Queen Rania St, 2V7F + 85 Amman, Jordan; Benjamin Bomfleur [bbomfleur@uni-muenster.de], Paläobotanik, Westfälische Wilhelms-Universität, Heisenbergstraße 2, 48149 Münster, Germany.

Female reproductive structures of Umaltolepis Krassilov and associated leaves of Pseudotorellia Florin from the Middle Jurassic of East Siberia, Russia

Female organs of Umaltolepis are recorded from the Middle Jurassic of East Siberia for the first time. A new species, Umaltolepis irkutensis, sp. nov., is described from the Aalenian–Bajocian Prisayan Formation of the Irkutsk Coal Basin. It is notable for having papillae on some subsidiary cells of the stomatal complexes, on some ordinary epidermal cells of the middle part of the lobes and on the cells near the lobe bases. Cupules of U. irkutensis were found in association with Pseudotorellia leaves described here as a new species Pseudotorellia irkutensis, sp. nov. Leaves of this species are long and narrow, they are peculiar in possessing predominantly short epidermal cells on the adaxial side of the leaf, ordinary epidermal cells with smooth periclinal walls, stomata arranged in not always clear bands on the abaxial side of the leaf, and the presence of papillae on the subsidiary cells of the stomata. The co-occurrence of U. irkutensis with leaves of P. irkutensis in the same samples from the Irkutsk Basin, as well as their similar epidermal pattern, suggests that these remains most likely belonged to the same Umaltolepis–Pseudotorellia plant. The morphology and epidermal features of Umaltolepis female organs are discussed.

Female reproductive structures of Umaltolepis Krassilov and associated short shoots, buds and leaves of Pseudotorellia Florin from the Middle Jurassic of Angren, Uzbekistan

Six species of Umaltolepis, the female organs of certain Pseudotorellia species, have been described previously from the Jurassic and Cretaceous of Iran, China, Central Mongolia and the Russian Far East. Remains of Umaltolepis are here recognized in the Middle Jurassic of Uzbekistan for the first time. Two new species – Umaltolepis sogdianica sp. nov. and U. involuta sp. nov. – are described from the Middle Jurassic Angren Formation (Angren, Uzbekistan). Umaltolepis sogdianica is peculiar in having papillae on the outer cupule cuticle near the lobe base. In contrast to other species, the cupule lobes of U. involuta are characterized by the inward bending of the lobe edges from the base to up to half of the lobe length and papillated epidermal cells of these edges. Reproductive structures of the new species were found in association with leaves of Pseudotorellia vachrameevii and P. gomolitzkyana, one short shoot, and numerous detached buds. Epidermal features of the buds are generally comparable to those of Umaltolepis and Pseudotorellia, but ordinary epidermal cells as well as subsidiary cells of the stomata of the buds, lack any cuticular thickenings and papillae, unlike Pseudotorellia leaves.

The leaves of Anabarella Abramova (Pinopsida) from the Cretaceous ofthe north of East Siberia (Russia)

The paper documents in detail the morphology, epidermal features and cuticle ultrastructure of the leaves of the Mesozoic conifer genus Anabarella Abramova 1984. For the first time, the leaf epidermal and cuticle structures of the type species Anabarella kryshtofovichii Abramova from the Albian–Cenomanian (Cretaceous) of the Anabar river basin (East Siberia, Arctic Russia) were studied with the scanning electron (SEM) and the transmission electron (TEM) microscopes. Emended diagnosis for the genus Anabarella and the diagnosis for the species A. kryshtofovichii are provided, since only a description of this species was given in the original publication. Because the holotype has been lost, a lectotype is selected. The cuticular membrane of Anabarella leaves belongs to the type 1 of the cuticle classification of Holloway 1982: it is made up of the cuticle proper A (composed of an outer polylamellate A1 layer and an inner homogeneous A2 layer) and a cuticular fibrillate layer B1. The leaves of Anabarella kryshtofovichii differ from other fossil conifers by a very thick cuticle membrane consisting predominantly of a cuticle proper A; the cuticular layer B1 is less than 1% from the total thickness of cuticular membrane in the ordinary epidermal cells. The studied leaves have both xeromorphic (thick cuticle and sunken stomata) and mesomorphic (amphistomatic leaves, unprotected stomata) features. The mesomorphic features of the Anabarella leaves, as well as the deciduousness, were probably an adaptation to the humid conditions of the mid-Cretaceous Arctic climate with warm and dark winters.

Histopathological evidences of early grapevine leaf senescence caused by Phakopsora euvitis colonisation

Grapevine rust, caused by Phakopsora euvitis, has recently been introduced in Brazil; however, this disease has spread nationwide, causing significant damage to vineyards. The pathogen reduces CO2 assimilation and photoassimilate availability in host plants. Grapevine rust causes early defoliation and yield reduction, in the subsequent crop, since storage of reserves is compromised. Infection, colonisation and defoliation processes caused by the pathogen are not completely understood. In order to shed light on monocyclic components of grapevine rust, we have carried out histopathological analyses of the interaction between Phakopsora euvitis and leaves of Vitis labrusca ‘Niagara Rosada’. Fully expanded leaves of grapevines were inoculated with a suspension of 105 urediniospores mL−1 of P. euvitis, and collected at 1, 2, 4, 8 and 22 days after inoculation. The samples were fixed and processed for analysis under light, scanning and transmission electron microscopy. Ultrastructural analyses indicated that the pathogen forms appressoria on the stomata and ordinary epidermal cells within 24 h of inoculation. Epidermal cells of the mature leaf did not present pre- or post-formed defense mechanisms to penetration of Phakopsora euvitis. However, mesophyll cells, when infected, produced callose and phenols to prevent fungal colonisation. Nevertheless, the deposition of these compounds, restricted to the haustorial neck, did not stop infection. Mesophyll cells from diseased leaves showed chloroplasts with plastoglobules and vacuoles filled with electron-opaque drops. Such structures are not present in healthy leaves but are present in healthy senescent grapevine leaves. Phakopsora euvitis seems to accelerate leaf senescence, which could be related to early defoliation observed in diseased plants.

Cuticle ultrastructure of Baiera furcata from Northeast China and its implication in taxonomy and paleoenvironment

A study on the leaf cuticle ultrastructures of Baiera furcata from the Lower Cretaceous Huolinhe Formation in East Inner Mongolia, Northeast China, was conducted with transmission electron microscopy (TEM) and elements analysis by Energy Dispersive Spectroscopy (EDS). TEM observation revealed the ultrastructural details from ordinary epidermal cells for both upper and lower cuticles, and stomatal apparatus, which were all made with A2 (granular) and B1 (fibrilous) layers. Additionally, well-preserved cell remnants were also observed. Comparisons with other cuticles of the Ginkgoales were made using statistical measurements and evaluations of some potential Order characteristics, and genus–species characteristics were also emphasized. Two potential ultrastructural groups can be recognized: Baiera–Sphenobaiera and Ginkgo–Ginkgoites–Pseudotorellia. This is reinforced by EDS element analysis, whereby ratios could also be compared with another closely related Ginkgoalean taxon Sphenobaiera huangii. The paleoenvironment significances is discussed, and it seems to support the TEM and EDS results. It indicates a signature in the cuticle fine details of Sphenobaiera, which has experienced a putatively warmer paleoenvironment than that of Baiera.

Cuticle ultrastructure of Pseudofrenelopsis gansuensis: Further taxonomical implications for Cheirolepidiaceae

A study of the cheirolepidiaceous conifer Pseudofrenelopsis gansuensis from the Lower Cretaceous of Wangqing Jilin Province in China was conducted in detail using scanning and transmission electron microscopy techniques. In total, nine ultrastructural features were recognized for the cuticle of this fossil plant, which are helpful in the distinguishing between cuticles of ordinary epidermal cells, subsidiary cells, guard cells and hypodermal cells of the stomatal apparatus. A three dimensional reconstruction of the cuticle ultrastructure was obtained. Pseudofrenelopsis gansuensis is the second species of this genus for which the cuticle ultrastructure has been statistically examined with 30 measurements and estimated confidence interval values. The close comparison of the cuticle ultrastructure characters, including statistical data, among Cheirolepidiaceae and other fossil conifers provides potential evidence of the taxonomic significance of this genus: ten characters are potentially valuable for specific separation, eleven parameters for generic separation and three parameters seem also to be useful for Family determination. The differences in the chemical composition according to preliminary statistical element analyses of the cuticles based on three ratios in two species of Pseudofrenelopsis, P. dalatzensis and P. gansuensis, should also be examined in future studies.

Leaf anatomy of Qualea parviflora (Vochysiaceae) in three phytophysiognomies of the Mato Grosso State, Brazil

ABSTRACT Leaves have a variety of morphological and anatomical characters mainly influenced by climatic, edaphic and biotic factors. The aim of this study was to describe the anatomical leaf traits of Qualea parviflora from three phytophysiognomies. The studied phytophysiognomies were Amazon Savannah on rocky outcrops (ASR), Transition Rupestrian Cerrado (TRC), and Cerradão (CDA). Freehand sections of the leaf blade were made and stained with 0.5% astra blue and with basic fuchsin. From the adaxial and abaxial leaf surface, freehand paradermal sections were made for epidermis analysis. The Jeffrey´s method, with modifications, was used in the epidermis dissociation process. The samples from the TRC phytophysiognomy had relatively smaller ordinary epidermal cells, higher abundance of trichomes, and mesophyll with few intercellular spaces, in comparison to the other phytophysiognomies. The leaves from the ASR phytophysiognomy had higher stomatal index (SI = 21.02), and five to six layers of sclerenchyma surrounding the midrib vascular bundle. The secondary vascular bundles had thicker cell walls and the bundle sheath extended up to the epidermal tissue of both leaf sides. Leaves from the CDA phytophysiognomy had mesomorphic environmental traits, such as a thinner cuticle. It is concluded that trees from ASR and TRC phytophysiognomies have xeromorphic traits following the environmental conditions where they occur.

A new species of the genus Sequoiadendron Buchholz (Cupressaceae) from the Upper Cretaceous of the Enmyvaam River Basin, Central Chukotka

A new conifer species, Sequoiadendron tchucoticum A. Sokolova from the Emuneret Formation on the Enmyvaam River (Anadyr River Basin) is described. It is established based on a thorough study of the morphology and epidermal features of shoot impressions, using scanning electron microscopy. The new species has polymorphic shoots with helical branching and three main leaf types: scalelike, subulate, and falcate. Leaves are amphistomatic; amphicyclic stomata are mostly obliquely arranged; ordinary epidermal cells are rectangular, frequently with oblique end walls, and their length-to-width ratio reaches 15: 1. Shoots of the new species prevail among conifers of the Ust’-Emuneret Assemblage. The age of the deposits enclosing the assemblage is debated; according to the latest data, it is estimated as Santonian–Early Campanian.