Abstract
Polyporus submelanopus, collected from Qinghai Province, Northwest China, is described and illustrated based on both morphological and phylogenetic analyses. It is characterized by a terrestrial habit, black-stipitate basidiocarps, circular to angular pores, two kinds of generative hyphae bearing simple septa and clamp connections respectively, and cylindrical smooth hyaline basidiospores. Morphologically, P. submelanopus belongs to the melanopus group and resembles P. melanopus in sharing similar pilei with a shallow central depression, circular to angular pores, basidiospores, and a terrestrial habit. However, P. melanopus has smaller pores, thicker and entire dissepiment, fusoid cystidioles, and clamped generative hyphae only. The differences between P. submelanopus and P. badius, P. xinjiangensis, and P. tubaeformis are discussed as well. Phylogenetic ITS sequence analysis supports P. submelanopus within the melanopus group but distinctly separate from other sampled species of this group.
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