Haploporus (fungus)

The genus Haploporus was circumscribed by mycologists Appollinaris Semenovich Bondartsev and Rolf Singer in 1944 with Haploporus odorus as the type, and only species.[2] The name Haploporus is derived from the Greek words απλόος ("simple"), and πόρος ("pore").[3]

Yu-Cheng Dai and colleagues treated the genus Pachykytospora as a synonym of Haploporus in 2002,[4] and then in subsequent publications.[5][6] Marcin Piątek proposed dividing Haploporus into two sections: sect. Haploporus (cap-like fruit bodies), and sect. Pachykytospora (crust-like fruit bodies).[7] Leif Ryvarden, who adopts a "pragmatic and conservative generic concept" in his 2014 work on European polypores, treats Haploporus as monotypic, containing only H. odorus.[8]

Using Haploporus tuberculosis as a representative generic exemplar, molecular analysis showed Haploporus to be nested within the core polyporoid clade, a phylogenetic grouping of fungi roughly equivalent to the family Polyporaceae.[9]

Haploporus species have an annual to perennial growth habit. They are crust like, with sessile or effused-reflexed (crust like with outside edges extended to form caps) fruit bodies. The hyphal system of Haploporus is dimitic to trimitic; the generative hyphae have clamp connections. The spores are oblong ellipsoid to roughly spherical, ornamented, thick-walled and cyanophilous.[10]

Haploporus fungi cause a white rot.[10]

As of January 2018, Index Fungorum accepts 6 species of Haploporus,[11] retaining Pachykytospora as an independent genus. In a 2016 taxonomic and phylogenetic study of the genus, Chinese scientists accept 13 species, including three newly described species from China.[10]

• Haploporus alabamae (Berk. & Cooke) Y.C.Dai & Niemelä (2002)
• Haploporus amarus X.L.Zeng & Y.P.Bai (1993)[12] – China
• Haploporus cylindrosporus L.L.Shen, Y.C.Dai & B.K.Cui (2016) – China[10]
• Haploporus latisporus Juan Li & Y.C.Dai (2007)[6] – China
• Haploporus nanosporus (A.David & Rajchenb.) Piątek (2005)[7]
• Haploporus nepalensis (T.Hatt.) Piątek (2003)[13] – Europe
• Haploporus odorus (Sommerf.) Bondartsev & Singer (1944)[2]
• Haploporus papyraceus (Cooke) Y.C.Dai & Niemelä (2002)
• Haploporus septatus L.L.Shen, Y.C.Dai & B.K.Cui (2016) – China[10]
• Haploporus subpapyraceus L.L.Shen, Y.C.Dai & B.K.Cui (2016) – China[10]
• Haploporus subtrameteus (Pilát) Y.C.Dai & Niemelä (2002)
• Haploporus thindii (Natarajan & Koland.) Y.C.Dai (2005)[5] – China; India[14]
• Haploporus tuberculosis (Fr.) Niemelä & Y.C.Dai (2002)