A new species of Sidera (Hymenochaetales, Basidiomycota) from tropical Asia

A new poroid wood-rotting fungus, Sidera vesiculosa, is described from Singapore based on morphological characters and phylogenetic analysis. The species is characterized by annual, resupinate and waxy fresh basidiocarps, small pores measuring 7-9 per mm, a monomitic hyphal system with vesicular cells, the presence of rosette-like crystals, allantoid to innate basidiospores measuring 2.9-3.7 x 0.6-1.0 mu m, and causing a white rot. Phylogenetic analysis inferred from ITS and nLSU sequences indicates that the new species forms a distinct lineage with strong support and is closely related to Sidera lowei.