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Abstract
Most species of the genus Leucoagaricus have been described from temperate regions in North America and Europe, but little is known about the genus from tropical areas. In this report we describe two new species of Leucoagaricus, namely La. flavovirens and La. atroazureus, from tropical China. The two species are characterized by turning blue-green or dark blue where bruised and by unique phylogenetic placement. Two new combinations, namely La. viriditinctus and La. caerulescens, are proposed. The neotype of La. viridiflavus from India was found to differ from La. flavovirens based on morphology and ITS sequence comparison. A monophyletic group of four bluing species from Old World tropics is recovered but with poor measures of branch support.
We are grateful for the help of Drs Else C. Vellinga, Gregory M. Mueller, Yan-Chun Li and Mrs Mo-Chan Li who offered advice, suggestions and analytical assistance. We thank Dr B. Aguirre-Hudson (K), Dr M.E. Noordeloos (L), Dr John H. Haines (NYS), Dr Tai-Hui Li (HMIGD), Dr Lin Guo (HMAS), Drs P. Manimohan and T.K.A. Kumar (CALI) for providing specimens. We are greatly indebted to Dr Brandon Matheny, University of Tennessee, and an anonymous reviewer for their valuable and critical comments. This study was supported by the Joint Funds of the National Natural Science Foundation of China and Yunnan Provincial Government (No. U0836604), by the National Basic Research Program of China (No. 2009CB522300), by the National Commonweal Foundation of the Research Institute of Tropical Forestry, CAF (RITF2007-12), by the National Science and Technology Support Project (2006BAD03A0405), by the National Natural Science Foundation of China (No. 30800004) and by the Ministry of Science and Technology of China (2008FY110300).
