中国竹林生境中小塔氏菌属一新种:竹生小塔氏菌OA

Tapinella(Tapinellaceae,Boletales,Basidiomycota)is a small but ecologically important genus of brown-rot fungi,with limited accepted species distributed mainly in temperate regions of the Northern Hemisphere.Based on morphological characteristics and multigene phylogenetic analyses(ITS,nrLSU,tef1-α,rpb1),a new species,Tapinella bambusicola,is described from bamboo forest habitats in Zhushan County,Hubei Province,China.The new species is characterized by large basidiomata(pileus 98-133 mm in diam.,fan-shaped to subfunnelform),an eccentric stipe densely covered with chestnut-brown to blackish-brown velvety tomentum,ovoid to broadly ellipsoid basidiospores(5.0-6.0×3.5-4.0 μm),abundant clavate to fusiform cheilocystidia(18-33×3.0-6.5 μm),and a saprotrophic habit on decayed wood and bamboo litter.Phylogenetic analyses indicate the new species as an independent lineage sister to T.atrotomentosa(ML/BI=100/1.00).Interspecific genetic distances between T.bambusicola and T.atrotomentosa across four gene regions(ITS:0.021 4;nrLSU:0.010 0;tef1-α:0.033 8;rpb1:0.023 6)were substantially greater than intraspecific distances(0.000 8-0.011 1),supporting its recognition as an independent species.T.bambusicola can be clearly distinguished from T.atrotomentosa by its significantly larger pileus(98-133 mm vs.40-50 mm),presence of abundant cheilocystidia(vs.absent),and growth in bamboo forest(vs.decaying wood of Pinus).This study expands the known substrate range of Tapinella,providing new data for research on fungal diversity in bamboo forests.