Talaromyces aspriconidius 2020

Talaromyces aspriconidius B.D. Sun, A.J. Chen, Houbraken & Samson 2020

MycoBank No: 833134 

Holotype: China, Yunnan, soil, 2008, isolated by L. Cai, Holotype CBS H-22833, culture ex-holotype CBS 141835 = DTO 340-F8. 

Morphological description

Colony diam, 7 d (mm). CYA 22–23; CYA 30 °C 25–26; CYA 37 °C 22–23; MEA 36–37; MEA 30 °C 44–45; OA 38–42; YES 28–29; CREA 7–8; CYAS No growth; DG18 10–11.

Colony characters. CYA 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white and peach (4); texture floccose; sporulation moderately dense; conidia en masse greyish yellow-green (68); soluble pigments absent; exudates absent; reverse buff (45). MEA 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white; texture floccose; sporulation moderately dense; conidia en masse leek green (49) and greyish yellow-green (68); soluble pigments absent; exudates brown droplets; reverse saffron (10). YES 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white and peach (4); texture floccose; sporulation moderately dense; conidia en masse greyish yellow-green (68); soluble pigments absent; exudates absent; reverse saffron (10). DG18 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white and primrose (66); texture floccose; sporulation dense; conidia en masse honey (64); soluble pigments absent; exudates absent; reverse greyish yellow-green (68). OA 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white and primrose (66); texture floccose; sporulation dense; conidia en masse yellow-green (71); soluble pigments absent; exudates clear droplets; reverse greyish yellow-green (68). CREA 25 °C, 7 d: Moderate growth, acid production absent.

Micromorphology. Conidiophores biverticillate, stipes smooth, 150–250 × 3–4 μm, metulae 4–5, divergent, 10–12 × 3–3.5 μm; phialides 4–6, acerose to flask shaped, 8–10.5 × 3–3.5 μm; conidia strikingly roughened, globose, 3–4 μm. Ascomata not observed.

Habitat: soil.

Distribution: China.

GenBank Accession: ITS:MN864274; BenA:MN863343;CaM: MN863320;RPB2 :MN863332.

Notes: . Talaromyces aspriconidius is characterized by its strikingly roughened, globose conidia. Talaromyces aculeatus, T. apiculatus, T. diversus, T. solicola and T. verruculosus also produce this kind of conidia. However, T. aspriconidius grows slower than T. aculeatus, T. apiculatus and T. verruculosus, and faster than T. diversus and T. solicola on CYA and CYA at 30 °C (Yilmaz et al. 2014).

Reference: Sun B-D, Chen AJ, Houbraken J (2020) New section and species in Talaromyces. MycoKeys 68: 75–113. https://doi.org/10.3897/mycokeys.68.52092

Talaromyces aspriconidius CBS 141835^T a colonies from left to right (top row) CYA, MEA, YES and OA; (bottom row) CYA reverse, MEA reverse, DG 18 and CREA b–g conidiophores and conidia. Scale bars: 10 μm (b–g).