A Phylogenetic and Taxonomic Study on Xylodon (Hymenochaetales): Focusing on Three New Xylodon Species from Southern China
Meng-Han Qu; Dong-Qiong Wang; Chang-Lin Zhao
Three wood-inhabiting fungal species, Xylodon laceratus, X. montanus, and X. tropicus spp. nov., were collected from southern China, here proposed as new taxa based on a combination of morphological features and molecular evidence. Xylodon laceratus is characterized by the resupinate basidiomata with grandinioid hymenophore having cracked hymenial surface, and ellipsoid basidiospores: X. montanus is characterized by the annual basidiomata having the hard, brittle hymenophore with cream hymenial surface, and ellipsoid to broadly ellipsoid basidiospores (3.9&ndash:5.3 ×: 3.2&ndash:4.3 µ:m): and X. tropicus is characterized by its grandinioid hymenophore with buff to a pale brown hymenial surface and subglobose basidiospores measuring 2&ndash:4.8 ×: 1.6&ndash:4 µ:m. Sequences of ITS and nLSU rRNA markers of the studied samples were generated, and phylogenetic analyses were performed with maximum likelihood, maximum parsimony, and Bayesian inference methods. The ITS+nLSU analysis of the order Hymenochaetales indicated that the three new species clustered into the family Schizoporaceae, located in genus Xylodon: based on further analysis of ITS dataset, X. laceratus was a sister to X. heterocystidiatus: X. montanus closely grouped with X. subclavatus and X. xinpingensis with high support: while X.tropicus was retrieved as a sister to X. hastifer.
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