Idriella chlamydospora Zhi.Y. Zhang, Y.F. Han & Z.Q. Liang, 2023

Zhang, Zhi-Yuan, Li, Xin, Chen, Wan-Hao, Liang, Jian-Dong & Han, Yan-Feng, 2023, Culturable fungi from urban soils in China II, with the description of 18 novel species in Ascomycota (Dothideomycetes, Eurotiomycetes, Leotiomycetes and Sordariomycetes), MycoKeys 98, pp. 167-220 : 167

Idriella chlamydospora Zhi.Y. Zhang, Y.F. Han & Z.Q. Liang sp. nov.

Fig. 28

Etymology.

Refers to the species that only produces chlamydospores.

Type.

China: Guangdong Province, Guangzhou City, Nanfang Hospital of Southern Medical University 23°19'14"N, 113°32'93"E, soil, 24 Aug 2019, Z.Y. Zhang (HMAS 351879 holotype designated here, ex-type living culture CGMCC 3.20778 = GZUIFR 21.921) .

Description.

Culture characteristics (14 d at 25 °C): Colony on PDA 40-41 mm diam., grey (30F1-30E1), flat, felty to pulverulent, nearly round, margin entire; reverse grey (29F1). Colony on MEA 31-33 mm diam., grey (6F1), compact, plicated, nearly round, margin entire; reverse soot brown (5F5) from centre to margin. Colony on OA 38 mm diam., grey (30F1) with a white circle, plicated, nearly round, margin entire; reverse greenish-grey (30E2).

Hyphae branched, septate, hyaline, smooth, 1.0-3.0 μm diam. Chlamydospores arising in axenic culture on PDA, MEA and OA, moniliform, 1-2-septate, brown, 7.5-20.0 × 6.5-11.0 µm (av. 18.5 × 8.6 μm, n = 50). Conidia were not observed. Sexual morph unknown.

Additional specimens examined.

China: Guangdong Province, Guangzhou City, South Campus of Sun Yat-sen University 23°10'04"N, 113°29'95"E, soil, 24 Aug 2019, Z.Y. Zhang, GZUIFR 21.922 .

Notes.

Idriella chlamydospora was isolated from soil in China. Phylogenetically, the new isolates CGMCC 3.20778 and GZUIFR 21.922 formed a single clade with a strongly-supported value and were nested in the genus Idriella (Fig. 27 ). However, morphologically, I. chlamydospora differs from other species in the genus Idriella in that it only produces chlamydospores.

Figures

Figure 27. Concatenated phylogeny of the ITS, LSU, TUB and RPB 2 gene regions of species in Microdochiaceae. Thirty-two strains are used. The tree is rooted in Cryptostroma corticale (CBS 218.52 and CBS 217.52). The tree topology of the BI was similar to the ML analysis. Bayesian posterior probability (≥ 0.8) and ML bootstrap values (≥ 80 %) are indicated along branches (PP / ML). Novel species are in blue and bold font, and " T " indicates type derived sequences.

Figure 28. Idriella chlamydospora (from ex-holotype CGMCC 3.20778) a-c upper and reverse views of cultures on PDA, MEA and OA 14 d after inoculation d-g chlamydospores. Scale bars: 10 µm (d-g).