摘要

Sixty-four taxa of Marasmius are reported representing fifty-seven species from northern Thailand. Comprehensive descriptions, illustrations, photographs, a dichotomous key to aid in their identification,. and comparisons with phenetically similar taxa are provided. Seventeen species are described as new: Marasmius araneocephalus, M. auratus, M. bondoi, M. brunneoolivascens, M. cafeyen, M. coarctatus, M. cupreostipes, M. delicatulus, M. ganyao, M. graminipes, M. imitarius, M. inthanonensis, M. jasminodorus, M. makok, M. pseudopellucidus, M. suthepensis and M. tantulus. Molecular phylogenetic reconstructions are presented based on ITS regions in Bayesian, likelihood and parsimony analyses. Phylogenetic data were strongly correlated with morphological data and were useful to aid in delimiting species and distinguishing among closely related species. ITS sequences were of limited use, however, in recognizing currently circumscribed infrageneric taxa at the series rank and higher.