Marasmiellomycena albodescendens (J.A. Cooper) Q.Na & Y.P.Ge, 2024

Na, Qin, Zeng, Hui, Hu, Yaping, Ding, Hui, Ke, Binrong, Zeng, Zhiheng, Liu, Changjing, Cheng, Xianhao & Ge, Yupeng, 2024, Morphological and phylogenetic analyses reveal five new species of Porotheleaceae (Agaricales, Basidiomycota) from China, MycoKeys 105, pp. 49-95 : 49

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).

Figures

Figure 1. Phylogenetic consensus tree inferred from the Maximum Likelihood (ML) analysis based on a concatenated ITS, nrLSU and rpb 2 dataset (MLB ≥ 75 %, BPP ≥ 0.90 are indicated). The tree is rooted with Mycena purpureofusca. The new species and combination are marked by red.