Morphological and phylogenetic analyses reveal five new species of Porotheleaceae (Agaricales, Basidiomycota) from China Author Na, Qin https://orcid.org/0000-0001-8406-6389 Institute of Mycological Science and Technology, School of Agriculture, Ludong University, Yantai 264025, China Author Zeng, Hui https://orcid.org/0000-0003-2025-844X Institute of Edible Fungi, Fujian Academy of Agricultural Sciences; National and Local Joint Engineering Research Center for Breeding & Cultivation of Features Edible Fungi, Fuzhou 350014, China Author Hu, Yaping https://orcid.org/0000-0003-1242-1139 Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, State Environmental Protection Scientific Observation and Research Station for Ecological Environment of Wuyi Mountains, Nanjing 210042, China Author Ding, Hui https://orcid.org/0000-0003-4490-2105 Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, State Environmental Protection Scientific Observation and Research Station for Ecological Environment of Wuyi Mountains, Nanjing 210042, China Author Ke, Binrong https://orcid.org/0009-0008-7209-7362 Institute of Edible Fungi, Fujian Academy of Agricultural Sciences; National and Local Joint Engineering Research Center for Breeding & Cultivation of Features Edible Fungi, Fuzhou 350014, China Author Zeng, Zhiheng https://orcid.org/0009-0008-4208-2629 Institute of Edible Fungi, Fujian Academy of Agricultural Sciences; National and Local Joint Engineering Research Center for Breeding & Cultivation of Features Edible Fungi, Fuzhou 350014, China Author Liu, Changjing College of Criminal Science and Technology, Nanjing Police University, Nanjing 210042, China Author Cheng, Xianhao https://orcid.org/0000-0002-5922-9913 Institute of Mycological Science and Technology, School of Agriculture, Ludong University, Yantai 264025, China Author Ge, Yupeng https://orcid.org/0000-0001-5754-201X Institute of Mycological Science and Technology, School of Agriculture, Ludong University, Yantai 264025, China & Institute of Edible Fungi, Fujian Academy of Agricultural Sciences; National and Local Joint Engineering Research Center for Breeding & Cultivation of Features Edible Fungi, Fuzhou 350014, China gaiyupeng@126.com text MycoKeys 2024 2024-04-25 105 49 95 http://dx.doi.org/10.3897/mycokeys.105.118826 journal article http://dx.doi.org/10.3897/mycokeys.105.118826 1314-4049-105-49 63E3C66A188C542C9F8FEECAAC0980CF Marasmiellomycena albodescendens (J.A. Cooper) Q.Na & Y.P.Ge comb. nov. Basionym. Porotheleum albodescendens J.A. Cooper, in Consiglio, Vizzini, Cooper, Marchetti, Angelini, Brugaletta & Setti, Riv. Micol. 64(2): 117, 2022. Type specimen. Holotype : New Zealand: North Island, Taupo, Tauhara Centre, 15 May 2011, PDD 96321. Selected description. Consiglio et al. (2022) . Distribution. New Zealand. Notes. Marasmiellomycena albodescendens has marasmielloid basidiomes, a pure-white pileus, relatively large spores, no hymenial cystidia and abundant, thick-walled pileocystidia and caulocystidia with yellowish contents. Unlike other species of Marasmiellomycena possessing a yellow, reddish-brown or yellowish-brown pileus, M. albodescendens can be easily recognised by its white pileus. The pileus of Marasmiellomycena albodescendens is macromorphologically more similar to some species of Marasmiellus Murrill ( Stevenson 1964 ); however, its micromorphological characteristics place this species in Marasmiellomycena , consistent with the results of our phylogenetic analysis (Fig. 1 ). Marasmiellomycena albodescendens has been infrequently collected in New Zealand, but is probably common and widespread and grows on small, dead, fallen branches and twigs in indigenous scrub and broad-leaf forests in late summer and autumn ( Consiglio et al. 2022 ).