Abstract
Lactifluus is an ectomycorrhizal, genetically diverse genus which consists of many species complexes. The genus is widely distributed in the tropics and drives important ecological and economic functions. However, its generic relations are poorly known and the diversity is mostly unexplored. In this study, we propose a new species, Lactifluus hezhangensis sp. nov. belongs to Lf. sect. Gerardii, from Guizhou Province, China. Lactifluus hezhangensis is characterized by a rugose and dark brown pileus, pruinose near center; white to cream lamella, and small basidiospores (4.79) 5.06–7.22 (7.30) × (4.67) 4.68–6.20 (6.59) μm). The phylogenetic analyses based on combined three-gene fragments of ITS + LSU + RPB2 confirmed that the new species is distinct from other Lactifluus species. Furthermore, the new species is described with color photographs and compared with similar taxa. We provide a phylogeny for Lf. sect. Gerardii based on ITS, LSU + RPB2 sequence data and the taxonomic status of the new species is briefly discussed.
References
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De Crop, E., Delgat, L., Nuytinck, J., Halling, R.E. & Verbeken, A. (2021) A short story of nearly everything in Lactifluus (Russulaceae). Fungal Systematics and Evolution 7: 133–164. https://doi.org/10.3114/fuse.2021.07.07
De Crop, E., Hampe, F., Wisitrassameewong, K., Stubbe, D., Nuytinck, J. & Verbeken, A. (2018) Novel diversity in Lactifluus section Gerardii from Asia: five new species with pleurotoid or small agaricoid basidiocarps. Mycologia 110 (5): 962–984.
De Crop, E., Kobeke, V., Wilde, S.D., Njouonkou, A.L., Kesel, A.D. & Verbeken, A. (2016) Lactifluus foetens and Lf. albomembranaceus sp. nov. (Russulaceae): look-alike milkcaps from gallery forests in tropical Africa. Phytotaxa 277 (2): 159–170. https://doi.org/10.11646/phytotaxa.277.2.3
De Crop, E., Nuytinck, J., Van de Putte, K., Wisitrassameewong, K., Hackel, J., Stubbe, D., Hyde, K.D., Roy, M., Halling, R.E., Moreau, P.-A., Eberhardt, U. & Verbeken, A. (2017) A multi-gene phylogeny of Lactifluus (Basidiomycota, Russulales) translated into a new infrageneric classification of the genus. Persoonia Molecular Phylogeny & Evolution of Fungi 38: 58–80. https://doi.org/10.3767/003158517X693255
Delgat, L., Courtecuisse, R., De Crop, E., Hampe, F., Hofmann, T.A., Manz, C., Piepenbring, M., Roy, M. & Verbeken, A. (2020) Lactifluus (Russulaceae) diversity in Central America and the Caribbean: melting pot between realms. Persoonia 44: 278–300. https://doi.org/10.3767/persoonia.2020.44.10
Delgat, L., Dierickx, G., Wilde, S.D., Angelini. C., De Crop, E., De Lange, R., Halling, R., Manz, C., Nuytinck, J. & Verbeken, A. (2019) Looks can be deceiving: the deceptive milkcaps (Lactifluus, Russulaceae) exhibit low morphological variance but harbour high genetic diversity. IMA Fungus 10: 14. https://doi.org/10.1186/s43008-019-0017-3
Duque B, J.A., Delgat, L., Galváo Elias, S., Verbeken, A., Neves, M.A. & Carvalho Jr., A.A. (2020) A new section, Lactifluus section Neotropicus (Russulaceae), and two new Lactifluus species from the Atlantic Forest, Brazil. Systematics and Biodiversity 18 (4): 1–15. https://doi.org/10.1080/14772000.2020.1769221
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Heilmann-Clausen. J., Verbeken, A. & Vesterholt, J. (1998) The genus Lactarius. Danish Mycological Society, Denmark, 287 pp.
Henkel, T.W., Aime, M.C. & Miller, S.L. (2000) Systematics of pleurotoid Russulaceae from Guyana and Japan, with notes on their ectomycorrhizal status. Mycologia 92: 1119–1132. https://doi.org/10.2307/3761479
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