Candolleomyces singeri (A. H. Sm.) D. Wacht. & A. Melzer, 2020

Yang, Kun L., Lin, Jia Y., Li, Guang-Mei & Yang, Zhu L., 2025, Introducing one new genus and two new species of Psathyrellaceae (Basidiomycota, Agaricales), with notes on Candolleomyces and Ephemerocybe, Phytotaxa 702 (1), pp. 1-28 : 16-17

(3.7) Candolleomyces singeri complex

Notes:— In the ITS-only phylogeny ( Fig. 4B ), five collections of ours and 13 collections representing seven legitimately proposed species established a large, heterogenous monophyletic group difficult for subdivision with significant support. In the four-locus phylogeny ( Fig. 4A ), this group was represented by nine collections with significant support. The two phylogenies together suggest a large species complex comprising seven legitimately proposed species, referred to as the Candolleomyces singeri complex in this study, characterized by basidiomata with a brownish pileus and palely colored basidiospores, as well as a terrestrial to lignicolous habit.

Legitimately proposed species recognized in this complex:— Cd. aberdarensis (A. Melzer, Kimani & R. Ullrich) D. Wächt. & A. Melzer (2020, holotype sequenced), Cd. eurysporus A. Karich, E. Büttner & R. Ullrich (2020, holotype sequenced), Cd. kotadduensis Haqnawaz & Niazi (2024 , holotype sequenced), Cd. ruhunensis A.N. Ediriweera, Voto, Karun. & Kumla (2023, holotype sequenced), Cd. singeri (A.H. Sm.) D. Wächt. & A. Melzer (2020) , Cd. subminutisporus T. Bau & J.Q. Yan (2021, holotype sequenced), and Cd. sulcatotuberculosus (J. Favre) D. Wächt. & A. Melzer (2020) .

Collections sequenced in this study:— China, Guangdong Province, Guangzhou City, elevation 5 m, 2024, Jia Y. Lin, L24208 ( HTBM2193 ), L24209 ( HTBM2194 ), L24210 ( HTBM2195 ), L24211 ( HTBM2196 ) and L24212 ( HTBM2197 ).

Figures

FIGURE 4. Phylogeny of Candolleomyces inferred from concatenated ITS-nrLSU-tef-1α-β-tub alignment (A; all samples with sequence data complete in the four loci) or ITS alignment (B). Nodes are annotated if supported by ≥50% MLB or ≥0.9 BPP. Branches shortened to fit the page are indicated by two diagonal lines, followed by the number of times shortened. Collections sequenced in this study are highlighted in gold. Holotypes, epitypes, and neotypes are indicated by HT, ET, and NT, respectively. Photos and line drawings of our collections, and species delimitation results are attached.