Abstract
Inonotus tenuicontextus collected from Guizhou, southwest China was described and illustrated as a new species based on a combination of phylogenetic and morphological evidence. It is characterized by perennial and effused-reflexed to pileate basidiocarps; duplex and very thin context; a monomitic hyphal system in context; a dimitic hyphal system in trama; and broadly ellipsoid, hyaline and thick-walled basidiospores. Phylogenetically I. tenuicontextus clustered within Inonotus s. s. clade; moreover, it formed a well supported monophyletic subclade with Inonotus baumii, I. linteus, I. lonicericola, I. vaninii and I. weirianus. In morphology I. tenuicontextus distinguishes from I. linteus, also a species with duplex context, by its smaller basidiospores, while its duplex context makes it different from the other four species with homogeneous context. We proposed this subclade as a medicinal group for most of its members with medicinal functions. The phylogeny of the six species in this medicinal group was briefly discussed based on our results. An identification key to them is also provided.
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