Talaromyces paecilomycetoides 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

Talaromyces paecilomycetoides Zhi.Y. Zhang, Y.F. Han & Z.Q. Liang sp. nov.

Fig. 11

Etymology.

Refers to the production of paecilomyces-like conidiophores.

Type.

China: Yunnan Province, Dali City, Dali University 25°67'32"N, 100°15'70"E, soil, 2 Sept 2019, Z.Y. Zhang (HMAS 351871 holotype designated here, ex-type living culture CGMCC 3.20785 = GZUIFR 21.894) ; ibid., GZUIFR 21.895 .

Description.

Culture characteristics (14 d at 25 °C): Colony on PDA 63-65 mm diam., mycelium white, planar, margins entire, slightly undulate, sporulation dense, conidia area masse dark green (28F8), soluble pigments and exudates absent; reverse greyish-green (28D5). Colony on MEA 11-13 mm diam., moderately deep, sulcate, mycelium white to buff, texture floccose, margins slightly irregular, sporulation moderately dense, conidia area masse orange white (5A2), soluble pigments and exudates absent; reverse raw umber (5F8). Colony on OA 68-70 mm diam., mycelium white, plane, texture velvety, margins entire, surrounded by an orange halo, sporulation dense, conidia area masse dark grey (1F1), soluble pigments light brown, exudates absent; reverse greyish-green (1C4).

Hyphae hyaline, septate, smooth, branched, 1.0-5.0 μm wide. Conidiophores monoverticillate, smooth, irregular or absent; stipes smooth, 7-20 × 1.5-4.0 μm. Metulae 1 or absent, 10.5-14.5 × 2.0-4.0 μm. Phialides 1-4, cylindrical, flask-shaped, sometimes borne on hyphae, 10.5-20.0 × 1.5-5.0 μm. Conidia smooth, obround, ovoid, subglobose, sometimes cylindrical, 3.0-9.5 × 1.5-5.0 μm (av. 6.5 × 3.6 μm, n = 50), produced in long chains. Sexual morph not observed.

Additional specimens examined.

China: Yunnan Province, Kunming City, Donglu Campus of Yunnan University 25°05'51"N, 102°70'21" E, soil, 31 Aug 2019, Z.Y. Zhang, GZUIFR 21.896, ibid., GZUIFR 21.897 .

Notes.

Talaromyces paecilomycetoides is one of several Talaromyces species with simple conidiogenous cells ( Peterson and Jurjević 2017). Phylogenetically, Talaromyces paecilomycetoides belongs to the section Talaromyces Subinflati and closely related with T. palmae (Fig. 8 ). Morphologically, they can be distinguished by their conidial shape and size (obround, ovoid, subglobose, sometimes cylindrical, 3.0-9.5 × 1.5-5.0 μm in T. paecilomycetoides ; subglobose to ellipsoidal 3-4.5 × 2-3.5 μm in T. palmae ) ( Yilmaz et al. 2014).

Figures

Figure 8. Concatenated phylogeny of the ITS, TUB, CaM and RPB 2 gene regions of species in Talaromyces from sections Islandici, Bacillispori and Subinflati. Fifty-six strains are used. The tree is rooted with Talaromyces brunneosporus (FMR 16566) and T. tenuis (CBS 141840). 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 11. Talaromyces paecilomycetoides (from ex-holotype CGMCC 3.20785) a-c upper and reverse views of cultures on PDA, MEA and OA 14 d after inoculation d-k phialides and conidia l conidia. Scale bars: 10 µm (d-l).