摘要

Aleurodiscus ryvardenii sp. nov. from southwestern China is described and illustrated. The species is characterized by possessing effused basidiocarps, simple-septate generative hyphae, moniliform gloeocystidia and verrucose basidiospores. Aleurodiscus tsugae on coniferous bark in East Asia is transferred to Aleurocystidiellum. Illustrated description of Aleurocystidiellum tsugae and a key to the three species of Aleurocystidiellum are given. The phylogeny of 29 species of Aleurdiscus s.l., Stereum and Xylobolus was inferred from ITS sequences.