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Hymenasplenium   obtusidentatum   , a new fern species of the    H.   excisum    subclade of    Hymenasplenium    (  Aspleniaceae  ) from south and southwestern China was described. Molecular phylogenetic analyses and morphological observations of    H.   obtusidentatum    and related species clearly indicated that this is a distinct taxonomic entity. Phylogenetically,    H.   obtusidentatum    was confirmed to represent a diverging lineage in the    H.   excisum    subclade of    Hymenasplenium    and was closely related to one lineage that includes accessions identified as    H.   obscurum   ,    H.   pseudobscurum    and    H.   tholiformis   . Morphologically,    H.   obtusidentatum    can be distinguished by the combination of its lamina base truncate, stipe not shiny and with color of reddish brown to dark brown, and pinna marginal teeth that are not sharp, but blunt or rounded. A complete species description and comparison with related species in the    H.   excisum    subclade were provided. The holotype of    H.   obtusidentatum    was designated.

﻿Molecular and morphological evidence reveals a new fern species of Hymenasplenium ( Aspleniaceae ) from south and southwestern China

Molecular and morphological evidence reveals a new fern species of Hymenasplenium ( Aspleniaceae ) from south and southwestern China