Abstract
Fulvifomes submerrillii (Hymenochaetaceae, Basidiomycota) is described from China based on both of morphological evidence and molecular data. The new species is characterized by perennial, pileate basidiocarps, encrusted, smooth pileal surface, 6–7 pores per mm with thick dissepiments, a dimitic hyphal system with interwoven skeletal hyphae, absence of setae or setal hyphae, ventricose cystidioles, and broadly ellipsoid, yellowish brown, thick-walled, smooth basidiospores, 4.7–5 × 3.7–4 μm. Phylogenetic analysis inferred from ITS and nLSU sequences indicates that the new species forms a separate well-supported clade, closely related to F. merrillii. However, F. merrillii has larger pores (4–5 per mm), a subdimitic hyphal structure in context, the contextual skeletal hyphae which regularly arranged and become swollen in KOH, and slightly longer (4.5–6 μm long) basidiospores. Moreover, one new combination (F. rigidus) is revived from synonym under Inonotus rigidus.
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