Two New Species of Sidera (Hymenochaetales, Basidiomycota) from Southwest China

Two new wood-inhabiting fungi, <i>Sidera salmonea</i> sp. Nov. and <i>S. tibetica</i> sp. Nov. in the order Hymenochaetales from southwest China, are described and illustrated based on molecular and morphological evidence. They were found on gymnosperm wood that is rotten and charred. The characteristics of <i>S</i><i>. salmonea</i> include annual, resupinate basidioma, salmon pores with distinctly white margins, angular pores (7-9 per mm), a dimitic hyphal system, and lunate basidiospores that are 3-3.5 × 0.9-1.1 μm. The characteristics of <i>S. tibetica</i> include annual, resupinate basidioma with a white to cream fresh pore surface that becomes cream to honey-yellow and shiny when dry, round pores (7-8 per mm), a dimitic hyphal system, and lunate basidiospores that measure 2.9-3.1 × 1-1.1 μm. A phylogenetic analysis based on the combined 2-locus dataset (5.8S + nuclear large subunit RNA (nLSU)) shows that the two species are members of the genus <i>Sidera</i>, and they are morphologically compared with related species, respectively. This paper provides a key to the identification of 16 accepted species of <i>Sidera</i> that are found throughout the world.