Camporesiomyces yusheensis Song Bai, Rong Wu & Jian Ma, 2025

Bai, Song, Wang, Fang, Wan, Su-Ran, Lv, Xiao-Kang, Chen, Li-Jun, Wu, Rong & Ma, Jian, 2025, Morphological and phylogenetic analyses reveal two new species of Camporesiomyces (Tubeufiaceae, Tubeufiales) from terrestrial habitats in China, MycoKeys 124, pp. 177-192 : 177-192

Camporesiomyces yusheensis Song Bai, Rong Wu & Jian Ma sp. nov.

Fig. 3 .

Etymology.

‘‘ yusheensis ” refers to the ‘‘Yushe National Forest Park” where the holotype was collected.

Holotype.

HKAS 128898 .

Description.

Saprobic on decaying wood in a terrestrial habitat. Sexual morph Not seen. Asexual morph hyphomycetous. Colonies on natural substratum superficial, effuse, scattered or aggregated, hairy, yellow at apex. Mycelium partly superficial, partly immersed, composed of branched, septate, guttulate, smooth-walled, hyaline to brown hyphae. Conidiophores 51–97 × 3.7–5.8 μm (x ̄ = 69 × 4.6 μm, n = 30), macronematous, mononematous, erect, solitary, smooth or occasionally verruculose, cylindrical, dark brown, paler towards apex, slightly flexuous, unbranched, 4–12 - septate, sometimes slightly constricted at septa. Conidiogenous cells 9.6–17.8 × 3.3–4.1 μm (x ̄ = 13.4 × 3.6 μm, n = 25), polyblastic, integrated, terminal, determinate, cylindrical, slightly tapering, conspicuously denticulate at conidial secession, subhyaline to pale brown. Conidia 15.4–23 × 4.5–6.8 μm (x ̄ = 19.3 × 5.3 μm, n = 35), acrogenous, solitary, cylindrical, obclavate or fusiform, 0–4 - septate, mostly 3–4 - septate, slightly flexuous, guttulate, brown to yellowish-brown.

Culture characteristics.

Conidia germinating on PDA within 15 hours, producing germ tubes from apices. Colony on PDA reaching 3.2 cm diam. after 41 days at room temperature (approximately 25 ° C), circular or irregular, umbonate, with undulate margin, pale brown to black, reverse black.

Material examined.

China • Guizhou Province, Liupanshui City, Shuicheng County, Yushe National Forest Park , on decaying wood in a terrestrial habitat, 27 November 2024, Xia Tang, LS 53 ( HKAS 128898 holotype; GZAAS 25–0667 , isotype), ex-type living culture GZCC 25–0636 ; Ibid., LS 63 ( GZAAS 25–0668 , paratype), living culture GZCC 25–0637 .

Notes.

In the phylogenetic analyses (Fig. 1 ), Camporesiomyces yusheensis formed a sister clade to C. bhatii with 90 % ML and 1.00 BYPP support. However, a comparison of nucleotides in the ITS, LSU, tef 1 - α and rpb 2 sequence between C. yusheensis and C. bhatii , revealed nucleotide differences of 25 / 494 bp (5.1 %, including five gaps), 4 / 855 bp (0.5 %, without gaps), 61 / 910 bp (6.7 %, without gaps) and 87 / 958 bp (9.1 %, without gaps), respectively. Moreover, C. yusheensis differs from C. bhatii by its shorter conidiogenous cells (9.6–17.8 μm vs. up to 21.7 μm) and shorter conidia (15.4–23 μm vs. up to 30 μm) ( Han et al. 2025). Therefore, based on ITS, LSU, tef 1 - α and rpb 2 sequence data and morphological characteristics, we introduce Camporesiomyces yusheensis as a new species.

Figures

Figure 1. Phylogenetic tree generated from the ML analysis, based on the combined ITS, LSU, tef 1 - α and rpb 2 sequence data. Bootstrap support values of ML equal to or greater than 75 % and Bayesian posterior probabilities (PP) equal to or greater than 0.95 are given near the nodes as ML / BYPP, respectively. The Maximum Likelihood (ML) and Bayesian Inference (BI) analyses yielded similar tree topologies. Hyphen (“ - ”) indicates a value lower than 75 % for ML and a posterior probability lower than 0.95 for BI. Botryosphaeria agaves (MFLUCC 10-0051) and B. dothidea (CBS 115476) were selected as outgroups (Lu et al. 2018 b). Ex-type strains are denoted with “ T ” and newly-obtained isolates are in bold black fonts.

Figure 3. Camporesiomyces yusheensis (HKAS 128898, holotype). a, b. Colonies on the host surface; c – f. Conidiophores and conidiogenous cells; g – n. Conidia; o. Germinated conidium; p, q. Colonies on PDA from above and below after 41 days of incubation at room temperature. Scale bars: 20 μm (c – f); 10 μm (g – j); 5 μm (k – o).