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Hourangia, a new genus of Boletaceae to accommodate Xerocomus cheoi and its allied species

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Abstract

Hourangia, a new genus in the Boletaceae, is erected to accommodate Xerocomus cheoi and allied species based on molecular phylogenetic analyses and morphological study. This genus can easily be distinguished from other genera of Boletaceae by the combination of the context of the stipe becoming first bluish, then reddish to brownish red, and finally brownish to blackish when cut, the thick hymenophore being 3–5 (7) times that of the pileal context, and the basidiospore surface with bacillate ornamentation. The phylogenetic analyses based on five gene markers (ITS, nrLSU, tef1-α, rpb1 and rpb2) recognized five distinct taxa. Four of them are treated here, with one undescribed due to lack of adequate material. A key to the four species of Hourangia is provided. Xerocomus punctilifer is treated as a synonym of H. cheoi according to the macro-morphological and micro-morphological comparative study. Epitypes are designated for H. cheoi, H. microcarpa and H. nigropunctata. Phylloporus pumilus, originally described from Indonesia, is transferred to Hourangia.

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Acknowledgments

The authors are very grateful to Prof. Y.J. Yao and Dr. T.Z. Wei for allowing access to the fungal collections in HMAS. Drs. B. Feng, Y.C. Li, Z.W. Ge, L.P. Tang, N.K. Zeng, X.F. Shi, Miss Y. J. Hao, J. Qin, T. Guo and Q. Cai are thanked for providing specimens. Dr. Z.X. Ren (KIB) is acknowledged for helping us in using the SEM facility. This work is supported by the Funds for International Cooperation and Exchange of the National Natural Science Foundation of China (31210103919), the National Basic Research Program of China (2014CB138305) and by the Fundamental Research Program of the Ministry of Science and Technology, China (2013FY110400). R.E. Halling thanks the National Science Foundation (USA) for funding under grants DEB-9972018, DEB-0414665 and DEB-1020421, and the National Geographic Society Committee for Research and Exploration in grants 7341–02 and 8457–08. A National Science Foundation (USA) grant to D.E. Desjardin (DED-0118776) provided REH the opportunity to collect in Indonesia.

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Correspondence to Zhu L. Yang.

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Zhu, XT., Wu, G., Zhao, K. et al. Hourangia, a new genus of Boletaceae to accommodate Xerocomus cheoi and its allied species. Mycol Progress 14, 37 (2015). https://doi.org/10.1007/s11557-015-1060-0

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  • DOI: https://doi.org/10.1007/s11557-015-1060-0

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