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

Fig. 29

Etymology.

Referring to the multiform conidia.

Type.

China: Jiangxi Province, Nanchang City, Nanchang People's Park 28°68'12"N, 115°91'35"E, soil, 13 Aug 2019, Z.Y. Zhang (HMAS 351880 holotype designated here, ex-type living culture CGMCC 3.20779 = GZUIFR 21.923) .

Description.

Culture characteristics (14 d at 25 °C): Colony on PDA 51 mm diam., grey (30F1) to dark green (30F4), felty, compact, margin entire to undulated; reverse dark green (30F4). Colony on MEA 27-30 mm diam., greenish-grey (30E2), flat, stellate striate with grey, margin entire to undulated; reverse dark green (30F4). Colony on OA 33-38 mm diam., greenish-grey (30E2), aerial mycelia dense, plicated, sectorisation, nearly round; reverse greenish-grey (30E2).

Hyphae branched, septate, hyaline, smooth, 1.0-4.0 μm diam. Conidiophores reduced to conidiogenous cells. Conidiogenous cells numerous, borne on hyphae or hyphal coil, erect, straight or flexuous, lageniform, 9.5-25.5 µm long, 1.0-3.0 µm wide at the base, apex inflated or globose and 1.0-2.5 µm diam. Conidia lunate, sometimes acerose, pointed at each end, non-septate, smooth-walled, colourless, 8.5-13.5 × 1.0-2.0 µm (av. 11.6 × 1.7 μm, n = 50). Chlamydospores are borne on hyphae, moniliform or branched, 1-2-septate, brown, 12.5-22.5 × 6.5-11.5 µm (av. 21.4 × 10.5 μm, n = 50). Sexual morph unknown.

Additional specimens examined.

China: Jiangxi Province, Nanchang City, Qianhu Campus of Nanchang University 28°65'68"N, 115°80'12"E, soil, 13 Aug 2019, Z.Y. Zhang, GZUIFR 21.924, ibid., GZUIFR 21.925 .

Notes.

According to Castañeda-Ruiz and Kendrick (1991), Idriella multiformispora and I. acerosa share similarities in terms of their lunate conidia and moniliform or branched chlamydospores. While introducing I. acerosa , Castañeda-Ruiz and Kendrick (1991) also noted that it bears a resemblance to I. desertorum . However, molecular data on I. acerosa are not available. Later, Hernández-Restrepo et al. (2016) established the genus Neoidriella , based on the molecular analysis of I. desertorum and removed it from the genus Idriella as the type species. In this study, I. multiformispora was phylogenetically categorised within the genus Idriella (Fig. 27 ). Morphologically, I. multiformispora can be differentiated from I. acerosa by its fewer septate chlamydospores ( Castañeda-Ruiz and Kendrick in 1991).

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 29. Idriella multiformispora (from ex-holotype CGMCC 3.20779) a-c upper and reverse views of cultures on PDA, MEA and OA 14 d after inoculation d-f conidiogenous cells and conidia g hyphal coil with phialides h-k chlamydospores. Scale bars: 10 µm (d-k).