Rickenella danxiashanensis, a new bryophilous agaric from China

A new fungal species growing on moss bed, Rickenella danxiashanensis, is described, illustrated and compared with phenotypically similar and phylogenetically related species. Morphologically, the new species is characterized by its omphalinoid basidiomata, yellow to deep orange pileus, decurrent lamellae, abundant lageniform to obclavate cystidia on cap and stipe surface, and small basidiospores (3.5–)4–6 × 3–4 μm. Phylogenetic analysis based on the internal transcribed spacer (ITS) region recognized it as a distinct species, which contribute to settle its taxonomic position in genus Rickenella.