Morphological and molecular data reveal one new species of Coltricia and one new species of Sidera in Hymenochaetales from South China

Two new poroid species of Hymenochaetales, <i>Coltricia subpusilla</i> and <i>Sidera pini</i>, are described from Anhui Province and Jiangxi Province based on morphological characters and multimarker phylogenetic analyses using a combined ITS, nLSU, and partial <i>tef</i>1 dataset. Phylogenetic results revealed that <i>C. subpusilla</i> is closely related to <i>C. pusilla</i> and that <i>S. pini</i> is related to <i>S. borealis</i>. <i>Coltricia subpusilla</i> was found on the bark of dead <i>Pinus</i> and is recognized by its annual, laterally stipitate, small, flabelliform to subcircular pilei, angular pores (2-3 per mm), and smooth to verrucose basidiospores. <i>Sidera pini</i> was found on fallen trunks of <i>Pinus massoniana</i> and is characterized by annual, resupinate basidiomata with angular pores (8-12 per mm), a dimitic hyphal system, and allantoid basidiospores. Detailed descriptions and illustrations of the two new species are provided.