Abstract
A new species of Lactarius subg. Lactarius from Baiyun Mountain, Guangdong Province in southern China is described based on phylogeny of the internal transcribed spacer (ITS) and morphological analyses. Lactarius baiyunensis sp. nov. is characterized by a light brown to white, azonate or inconspicuously zonate pileus, irregular brownish spots on the stipe, latex unchanging in color, small globose to subglobose basidiospores with pronounced ornamentation, absence of cheilocystidia and an ixotrichoderm for a pileipellis. The new species is presented with illustrated description, and comparisons of morphology and phylogeny are made with closely related species.
References
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Herrera, M., Montoya, L. & Bandala, V.M. (2018) Two Lactarius species (subgenus Plinthogalus) in ectomycorrhizal association with tropical Quercus trees in eastern Mexico. Mycologia 110 (6): 1033–1046. https://doi.org/10.1080/00275514.2018.1521685
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Kalyaanamoorthy, S., Minh, B.Q., Wong, T.K.F., von Haeseler, A.& Jermiin, L.S. (2017) ModelFinder: fast model selection for accurate phylogenetic estimates. Nat Methods 14 (6): 587–589. https://doi.org/10.1038/nmeth.4285
Kumar, J. & Atri, N.S. (2021) Morphology and phylogeny of one new species of Lactarius (Family Russulaceae) associated with Shorea from the foothills of Himalayas, India. Nova Hedwigia 112 (3–4): 413–427. https://doi.org/10.1127/nova_hedwigia/2021/0621
Kumar, S, Stecher, G., Tamura, K. (2016) MEGA7: Molecular Evolutionary Genetics Analysis Version 7.0 for Bigger Datasets. Mol Biol Evol 33 (7): 1870–1874. https://doi.org/10.1093/molbev/msw054
Latha, K.P.D., Raj, K.N.A., Farook, V.A., Sharafudheen, S.A., Parambil, N.K. & Manimohan, P. (2016) Three new species of Russulaceae from India based on morphology and molecular phylogeny. Phytotaxa 246 (1): 61–77. https://doi.org/10.11646/phytotaxa.246.1.5
Le, H.T., Nuytinck, J., Verbeken, A., Lumyong, S. & Desjardin, D.E. (2007) Lactarius in Northern Thailand: 1. Lactarius subgenus Piperites. Fungal Diversity 24: 173–224.
Lee, H., Wissitrassameewong, K., Park, M.S., Verbeken, A., Eimes, J. & Lim, Y.W. (2019) Taxonomic revision of the genus Lactarius (Russulales, Basidiomycota) in Korea. Fungal Divers 95 (1): 275–335. https://doi.org/10.1007/s13225-019-00425-6
Li, G.J., Zhang, C.L., Lin, F.C. & Zhao, R.L. (2018) Hypogeous gasteroid Lactarius sulphosmus sp. nov. and agaricoid Russula vinosobrunneola sp. nov. (Russulaceae) from China. Mycosphere 9 (4): 838–858. https://doi.org/10.5943/mycosphere/9/4/9
Nuytinck, J. (2013) Not every milkcap is a Lactarius. Scripta Botanica Belgica 51: 162–168.
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