Trechisporales emended with a segregation of Sistotremastrales ord. nov. (Basidiomycota)
Shi‐Liang Liu, SH He, XW Wang, Tom W. May, Gang He, Shu‐Ling Chen, LW Zhou
Abstract
Trechisporales, typified by Trechispora and equivalent to Hydnodontales, is a recently introduced order within Agaricomycetes.This order only comprises one family Hydnodontaceae and 16 independent genera, but the relationships among these genera are not fully clarified.Here, via a wider sampling especially from Asia Pacific, careful morphological examinations and comprehensive multilocus-based phylogenetic analyses, the classification of Trechisporales is emended.Sertulicium and Sistotremastrum are segregated from Trechisporales, and placed in the new family Sistotremastraceae within the new order Sistotremastrales.A new genus Allotrechispora segregated from Trechispora is introduced within Hydnodontaceae, Trechisporales, and Boidinella, Litschauerella and Sphaerobasidium are excluded from Trechisporales.Brief summaries to genera accepted in Sistotremastrales and Trechisporales, and a key to all 12 genera accepted in Trechisporales are provided.In addition, Tomentella and Murrilloporus, potential synonyms of Trechispora, are excluded from Trechisporales and of uncertain position, respectively.At the species level, 19 new species are described with one from Allotrechispora, one from Fibrodontia, one from Subulicystidium and 16 from Trechispora, and seven new combinations are proposed with two for Allotrechispora and five for Trechispora.In addition, Trechispora yunnanensis is excluded from Trechispora.A key to all 87 species accepted in Trechispora is provided.In conclusion, an emended classification of Trechisporales within Agaricomycetes is constructed, which will help to further clarify species diversity and explore trait evolution within Trechisporales.