The Hymenochaete cinnamomea – H. fuliginosa complex (Hymenochaetales, Basidiomycota) : a revision

The taxonomy of two collective Hymenochaetespecies, H. cinnamomea and H. fuliginosa, is revised via morphological evidence and DNA data (ITS, LSU, and TEF1 regions). Study of the type of Thelephora fuliginosa (= H. fuliginosa) revealed that the name should be placed among the synonyms of Hydnoporia tabacina. As hitherto understood, H. fuliginosa is shown to cover six species, viz. the reinstated H. fusca and H. tenuis, both widespread in the Northern Hemisphere, and four new species, H. clandestina (Europe and Macaronesia), H. furva (North Europe), H. lesurae (Central Europe), and H. obsoleta (the North American North-West). The name H. tenuis was misapplied in East Asia, and a new species, H. daurica, is therefore described. The present concept of H. cinnamomea covers at least ten species. Of them, H. arida, H. cinnamomea s. str., H. fibrillosa, H. laxa, H. rudis, and H. spreta are restored as good species, and H. floccula (East Asia), H. scabra (North America and Europe), H. similis, and H. tenebraria (North America and East Asia) are introduced as new. Additionally, the identity of H. carpatica, H. corticolor, and H. epichlora is clarified based on newly collected and sequenced material.