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Contu 2000). Recent molecular phylogenetic analyses place Oudemansiella and Xerula in the Physalacriaceae clade (Moncalvo et al. 2002;

Wilson &

Desjardin 2005;

Matheny et al. 2007), and document that taxa of Oudemansiella and Xerula are resolved into two separate monophyletic clades (Zhang et al. 2003;

Binder et al. 2006;

Zhang 2006). Petersen (2008c) stated that Xerula in his definition is not monophyletic. Wang et al. (2008) Vol.28 No.1

3 http://journals.im.ac.cn/jwxtcn treated Xerula as a distinct genus, but in a restricted sense that includes only hispid species such as X. pudens (Pers.) Singer and its close allies that have a collybioid basidioma with dry surfaces of the pileus and the stipe covered with erect, lanceolate, yellow to brown, thick-walled setae, subacerose basidioles in the hymenium and a fertile lamellar edge, while Oudemansiella sensu stricto accommodates non-hispid species that have sterile lamellar edges with crowded cheilocystidia and clavate to narrowly basidioles in the hymenium. Based on morphology and the molecular phylogenetic analyses of Zhang et al. (2003) and Zhang (2006), a new systematic arrangement for Oudemansiella s. str. is proposed.

1 MATERIALAND METHODS Over

150 collections of Oudemansiella and Xerula from Asia, Europe, Australia, and North and Central America were examined, but only specimens from which illustrations in the present paper were made are listed below. Oudemansiella canarii (Jungh.) H?hn. C China. Wild Elephant Valley, Jinghong County, Yunnan Prov., alt. 650m,

1 September 2004, X.H. Wang

1820 (HKAS 5021). O. aff. crassifolia Corner C China. Longdao, Ruili County, Yunnan Prov., alt. 1200m,

2 August 2003, P.C. Liu

87 (HKAS 43500). O. mucida (Schrad.: Fr.) H?hn. C Germany. Oberjoch, Allg?u, Bayern,

1 October 1997, Z.L. Yang

2111 (HKAS 31558). O. platensis (Speg.) Speg. C Colombia. Estación Cientifica de la Universidad National, Mpio de Leticia, Dpto de Amazonas,

4 May 1992, A.E. Franco-Molano

810 (HKAS 45442, duplicate of NY 34703). O. venosolamellata (Imazeki &

Toki) Imazeki &

Hongo C Japan. Mt. Hayachine, Kawai, Iwate Prefecture,

8 August 1988, H. Neda s.n. (TFM-M-A843). O. steffenii (Rick) Singer C Brazil. S?o Leopoldo, Rio Grande do sul, 1932, J. Rick s.n. [FH, holotype of Oudemansiella echinosperma Singer, which is usually treated as a synonym of O. steffenii by Singer (1964) and other authors]. O. submucida Corner C China. Mengxiu, Ruili County, Yunnan Prov., alt. 1190m,

28 July 2003, P.C. Liu

45 (HKAS 43457). O. aff. submucida Corner C China. Mt. Changbai, Antu County, Jilin Prov., alt. 840m,

15 August 2004, L.F. Zhang

497 (HKAS 7622). Macromorphological characters were described based on fresh material, colored photos, and/or field-notes. For micromo........