Abstract
During a survey of Xylariales in northern Thailand, several specimens with affinities to the genus Daldinia were found and examined for morphological characters, secondary metabolites, and molecular phylogenetic traits. Aside from morphological and chemotaxonomic studies, a multi-locus phylogenetic analysis using internal transcribed spacers regions (ITS) and the large subunit (LSU) of the ribosomal DNA, the second largest subunit of the RNA polymerase (RPB2), and beta-tubulin (TUB2) genes was performed. Among the specimens was a new species and a new record of a species that had previously never been sequenced and studied for its anamorphic morphology. This species, previously described by Ju and Rogers as Hypoxylon kretzschmarioides based on a single record from Indonesia, showed secondary metabolite profiles reminiscent of those of the genus Daldinia and even clustered in the latter genus in the phylogenetic tree. Therefore, it is transferred to Daldinia as D. kretzschmarioides comb. nov. A second new species, D. subvernicosa sp. nov., was found to have a close relationship with D. vernicosa based on morphological and molecular evidence, but differs from D. vernicosa by long-stipitate asci with mostly subglobose ascospores, and the basal ascospores are often elongated.
Highlights
The genus Daldinia was described by Cesati and De Notaris (1863) and belongs to the Hypoxylaceae (Xylariales), since the recent rearrangement of the families of stromatic
While only internal transcribed spacers regions (ITS) data had been used in the latter study, Wendt et al (2018) have included several species and demonstrated by using a multi-locus phylogeny that Daldinia and allied species represent an independent lineage in the Hypoxylaceae that is different from Hypoxylon as well as from the genus Pyrenopolyporus, which was resurrected and amended to accommodate some species with superficial similarities to D. placentiformis
The cultures and the material vouchers were deposited in Thailand Bioresource Research Center (TBRC) and BIOTEC Bangkok Herbarium (BBH), respectively
Summary
The genus Daldinia was described by Cesati and De Notaris (1863) and belongs to the Hypoxylaceae (Xylariales), since the recent rearrangement of the families of stromaticSarunyou Wongkanoun, Lucile Wendt, Marc Stadler and Jennifer Luangsa-ard contributed to this work.Section Editor: Roland KirschnerTaxonomic novelties: Daldinia subvernicosa Srikitikulchai, Wongkanoun, M. (1909) has for long been included in the genus Hypoxylon, to which it had belonged until Hsieh et al (2005) provided evidence from molecular phylogenetic data that its affinities are with Daldinia.
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