Scytalidium chlamydosporum S. Q. Tong & Zhi. Y. Zhang, 2025

5. Scytalidium chlamydosporum S. Q. Tong & Zhi. Y. Zhang , sp. nov.

Fig. 3 View Figure 3

Type.

CHINA • Guizhou, Guiyang, Xiuwen County, Liuguang Town , 26.99°N, 116.44°E, soil, 5 July 2022, Shuo-Qiu Tong ( holotype HMAS 354096 View Materials , dried culture; ex-type CGMCC 3.28993 View Materials , ibid., SQT 10) GoogleMaps

Etymology.

Refers to the species that only produces chlamydospore-like cells.

Description.

Culture characteristics (14 days at 25 ° C): Colonies on PDA attaining 80–82 mm diam., flat, cottony, margin entire, gray-yellow (4 A 2) to pale gray (30 B 2). Reverse gray-yellow (4 A 2) to pale gray (30 B 2). Colonies on SNA fast-growing, more than 90 mm, flat, tomentose, pale gray (30 B 2). Reverse pale gray (30 B 2).

Mycelium consisting of hyaline, smooth-walled, branched, septate, 1–3 μm diam hyphae. Chlamydospore-like cells yellow-brown to dark brown, oblong to globose, ellipsoidal, 0–1 - septate, thick-walled, smooth, solitary, catenate, 6–11.5 × 6–8.5 µm (avg. 8.5 × 7.1 μm, n = 30). Conidia and Arthroconidia unknown. Sexual morph unknown.

Geographical distribution.

Guizhou Province, China.

Additional material examined.

CHINA • Guizhou, Guiyang, Huaxi District, Shiban Town , 26.46°N, 106.65°E, soil, 8 July 2022, Shuo-Qiu Tong, SQT 11, ibid. SQT 12 GoogleMaps .

GenBank numbers.

SQT 10 – SQT 12, ITS: PV 890025 – PV 890027, LSU: PV 890032 – PV 890034.

Notes.

Phylogenetic analysis showed that three new isolates (SQT 10 – SQT 12) clustered in a single subclade with high supported value (100 / 1) and were closely related to S. cuboideum and S. sphaerosporum (Figs 1 View Figure 1 , 2 View Figure 2 ). Morphologically, S. chlamydosporum differs from S. cuboideum by its absent arthroconidia and production of chlamydospore-like cells ( Kang et al. 2010). Scytalidium chlamydosporum differs from S. sphaerosporum by its absent sexual morph and production of chlamydospore-like cells ( Kang et al. 2010). Furthermore, based on a pairwise comparison of ITS, S. chlamydosporum (ex-type CGMCC 3.28993 ) differs from S. cuboideum (ex-isotype UAMH 676 ) by 10.9 % (60 / 549 bp, 21 gaps) and from S. sphaerosporum (ex-type ATCC 34392 ) by 12.4 % (64 / 513 bp, 28 gaps). Scytalidium chlamydosporum was isolated from soil in a pepper cultivation area and is likely to have a saprophytic lifestyle.