Two New Species of Dacrymyces (Dacrymycetales, Basidiomycota) from Southwestern China

Two new species of Dacrymyces, D. cerebriformis and D. sinostenosporus, are presented from southwestern China, based on morphological characteristics and phylogenetic analyses. Dacrymyces cerebriformis is characterized by obviously cerebriform basidiomata when mature, hyphae without clamp connections, and hyaline, thin-walled, allantoid, 0-7-septate basidiospores (18.4-23.1 x 5.5-7.7 mu m). Dacrymyces sinostenosporus is characterized by discoid and applanate basidiomata when mature, hyphae without clamp connections, and hyaline, thin-walled, cylindrical to allantoid, 0-7-septate basidiospores (18.0-23.5 x 6.3-8.0 mu m). Dacrymyces cerebriformis can be distinguished from D. sinostenosporus by the narrower thin- or thick-walled terminal cells in the marginal hyphae of the sterile surface (1.7-3.5 mu m vs. 3.5-6.0 mu m in diameter) and thinner basidiospores (Q = 3.14-3.28 vs. Q = 2.63-2.77). A phylogenetic analysis of Dacrymyces is performed by using a dataset composed of concatenated internal transcribed spacer regions (ITS) and a large subunit (nrLSU) of ribosomal DNA gene, and two new species nested in two distinct lineages with robust support. A full description and illustrations of the two new species are provided here.

Automated summary

Two new species of Dacrymyces, D. cerebriformis and D. sinostenosporus, have been discovered in southwestern China. They are distinguished by their distinct morphological characteristics and phylogenetic relationships, as well as their unique basidiospores.