Phylogeny and diversity of Haploporus (Polyporaceae, Basidiomycota)

Four species of Haploporus, H. angustisporus, H. crassus, H. gilbertsonii and H. microsporus are described as new and H. pirongia is proposed as a new combination, based on morphological characteristics and molecular phylogenetic analyses inferred from internal transcribed spacer (ITS) and large subunit nuclear ribosomal RNA gene (nLSU) sequences. Haploporus angustisporus, H. crassus and H. microsporus occur in China, H. gilbertsonii occurs in the USA, and the distribution of H. pirongia is extended from New Zealand to Australia. Haploporus angustisporus is characterized by the distinct narrow oblong basidi-ospores measuring 10.5-13.5 x 3.9-5 mu m. Haploporus crassus is characterized by the presence of ventricose cystidioles occasionally with a simple septum, dissepimental hyphae usually with a simple septum, unique thick-walled basidia and distinctly wide oblong basidiospores measuring 13.5-16.5 x 7.5-9.5 mu m. Haploporus gilbertsonii is characterized by its large pores (2-3 per mm), a dimitic hyphal structure with non-dextrinoid skeletal hyphae and wide oblong basidiospores measuring 12-15 x 6-8 mu m. Haploporus microsporus is characterized by distinctly small pores (7-9 per mm), the presence of dendrohyphidia, and distinctly small ellipsoid basidiospores measuring 5.3-6.7 x 3-4.1 mu m. Haploporus pirongia is proposed as a new combination. Haploporus amarus is shown to be a synonym of H. odorus and Pachykytospora wasseri is considered a synonym of H. subtrameteus.