Lentinellus castoreus is a complex group. A new taxon under this species was found in northeast of China in this study. The new one was distinguished from the other sub-taxon by its morphological characteristics of denty tomentum, subdistant lamellae and inamyloid hyphae. The assignment of the new taxon was supported by phylogenetic analyses based on the internal transcribed spacer (ITS) sequences. The results of molecular analyses demonstrated that the subspecies was clustered in a clade which included the sequences of Chinese, Russian and Japanese. It is named as Lentinellus castoreus subsp. orientalisYu Liu and Tolgor Bau after the authors examined specimens with the morphological and molecular taxonomic methods.
Key words: New subspecies, morphology, taxonomy, phylogenetic tree.
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