Nigroboletus Gelardi, Vizzini, E. Horak, T.H. Li & Ming Zhang, in Gelardi et al., PLoS ONE 10(8): e0134295, 6 (2015)
Etymology: the generic epithet “nigro” (black) is derived from Latin adjective niger and refers to the conspicuous, overall blackening of the tissues when injured.
Basidiome stipitate–pileate with tubular hymenophore, epigeal, evelate, medium–small sized. Pileus convex to applanate, subtomentose to glabrous; hymenophore very thin, poroid, adnate to subdecurrent, yellow to olive–yellow. Stipe solid, dry, smooth to minutely pruinose-punctate, reticulation absent; context firm, yellowish; tissues turning dull grayish to blackish throughout when injured or exposed; taste mild. Spore print olive–brown. Spores smooth, broadly ellipsoid to subovoid; Pleuro–, heilo—and Caulocystidia present; Pileipellis consisting of subparallel to loosely interwoven erect hyphae; hymenophoral trama bilateral–divergent of the Boletus–type or intermediate between the Boletus–type and the Phylloporus–type; lateral stipe stratum of the boletoid type; Clamp connections absent; ontogenetic development gymnocarpic.
Index fungorum number: IF813026
Type species: Nigroboletus roseonigrescens Gelardi, Vizzini, E. Horak, T.H. Li & Ming Zhang 2015, in Gelardi et al., PLoS ONE 10(8): e0134295, 6 (2015)
Gelardi M, Vizzini A, Ercole E, Horak E, Ming Z, Li TH (2015) Circumscription and taxonomic arrangement of Nigroboletus roseonigrescens gen. et sp. nov., a new member of Boletaceae from tropical South–Eastern China. PLoS ONE 10(8):e0134295