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. Haploporusangustisporus, 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. Haploporusangustisporus is characterized by the distinct narrow oblong basidiospores measuring 10.5-13.5 × 3.9-5 µm. Haploporuscrassus 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 × 7.5-9.5 µm. Haploporusgilbertsonii 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 × 6-8 µm. Haploporusmicrosporus is characterized by distinctly small pores (7-9 per mm), the presence of dendrohyphidia, and distinctly small ellipsoid basidiospores measuring 5.3-6.7 × 3-4.1 µm. Haploporuspirongia is proposed as a new combination. Haploporusamarus is shown to be a synonym of H.odorus and Pachykytosporawasseri is considered a synonym of H.subtrameteus.

Beijing Advanced Innovation Center for Tree Breeding by Molecular Design Beijing Forestry University Beijing 100083 China

Beijing advanced innovation centre for tree breeding by molecular design Institute of Microbiology PO Box 61 Beijing Forestry University Beijing 100083 China

Biology Centre of the Academy of Sciences of the Czech Republic Branišovská 31 CZ 370 05 České Budějovice Czech Republic

College of Plant Protection Nanjing Agricultural University Nanjing Jiangsu 210095 China

Royal Botanic Gardens Victoria Melbourne Victoria 3004 Australia

School of Economics and Management Beijing Forestry University Beijing 100083 China

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