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Abstract
In this report we describe the three species in Lepiota sect. Lepiota occurring in tropical China. Lepiota attenuata is a new species and is characterized by a pileus with brownish yellow squamules and radially sulcate striate margin, penguin-shaped spores that are distinctively narrowed toward the apex and inflated submoniliform or catenulate elements in the pileus covering. We compared the type specimens of L. metulispora and L. thrombophora with tropical Chinese specimens; both taxa occur in the study area. Phylogenetic relationships among the tropical Chinese species and other closely related species in the genus were inferred based on DNA sequences of the nuclear ribosomal genes (ITS, LSU and IGS) and the mitochondrial small ribosomal RNA gene (mtSSU).
The authors are grateful for the help of Drs B. Aguirre-Hudson (K) and Lin Guo (HMAS) who provided specimens. We also thank Dr Timothy Y. James, University of Michigan, for reviewing the manuscript. We are greatly indebted to Dr Else Vellinga, University of California, and two anonymous reviewers for their valuable and critical comments. This study was supported by the National Natural Science Foundation of China (No. 31070014), the Knowledge Innovation Program of CAS (No. KSCX2-YW-G-025), the Joint Funds of the National Natural Science Foundation of China and Yunnan Provincial Government (No. U0836604), the National Basic Research Program of China (No. 2009CB522300), the Foundation of RITF (RITFKYYW2010-10) and Commonweal Industry-specific Foundation of State Forestry Administration (201104057).