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

Sun, Bing-Da, Chen, Amanda J., Houbraken, Jos, Frisvad, Jens C., Wu, Wen-Ping, Wei, Hai-Lei, Zhou, Yu-Guang, Jiang, Xian-Zhi & Samson, Robert A., 2020, New section and species in Talaromyces, MycoKeys 68, pp. 75-113 : 75

Talaromyces rufus B.D. Sun, A.J. Chen, Houbraken & Samson sp. nov. Fig. 11

Typus.

China, Yunnan, soil, 2009, isolated by T.S. Zhou, Holotype CBS H-22832, culture ex-holotype CBS 141834 = DTO 349-D7 = CGMCC 3.13203.

Additional material examined.

Korea, soil, 2013, isolated by J. Houbraken, culture DTO 274-C5.

ITS barcode.

MN864272. Alternative identification markers: BenA = MN863341, CaM = MN863318, RPB2 = MN863331.

Diagnosis.

This species produces red, determinate synnemata and ellipsoidal, spiny ascospores measuring 5-6 × 4-5 μm.

In.

Talaromyces section Talaromyces

Colony diam, 7 d (mm).

CYA 12-16; CYA 30 °C 18-20; CYA 37 °C 15-16; MEA 37-38; MEA 30 °C 50-51; OA 38-40; YES 26-27; CREA Weak growth; CYAS No growth; DG18 9-13.

Colony characters.

CYA 25 °C, 7 d: Colonies deep, plane; margins entire; mycelium white and scarlet (5); texture floccose; sporulation sparse; conidia en masse greyish yellow-green (68); soluble pigments scarlet (5); exudates absent; reverse scarlet (5). MEA 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white and scarlet (5); texture floccose; sporulation sparse; conidia en masse greyish yellow-green (68); soluble pigments scarlet (5); exudates absent; reverse scarlet (5). YES 25 °C, 7 d: Colonies moderately deep, raised at center, plane; margins entire; mycelium white and scarlet (5); texture floccose; sporulation absent; soluble pigments absent; exudates scarlet (5) droplets; reverse scarlet (5) at center, fading into peach (4). DG18 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white; texture smooth and sticky; sporulation absent; soluble pigments absent; exudates absent; reverse cream white. OA 25 °C, 7 d: Colonies low, plane; margins entire; mycelium white and scarlet (5); texture floccose; sporulation absent; soluble pigments scarlet (5); exudates absent; reverse scarlet (5). Ascomata present. CREA 25 °C, 7 d: Acid production absent.

Micromorphology.

Conidiophores solitary and monoverticillate; stipes smooth, 5-30 × 2.5-3 μm; phialides1-4, acerose, 10-12 × 3-4 μm; conidia smooth, ellipsoidal to fusiform, 2.5-4.5 × 2-3 μm. Ascomata maturing within 2-3 wk on OA, subglobose to ellipsoildal, 350-600 × 200-350 μm, yellow, ascospores ellipsoidal, spiny, 5-6 × 4-5 μm.

Notes.

Talaromyces rufus is characterized by its red determinate synnemata on all tested media except DG18, CYAS and CREA. According to Yilmaz et al. (2014), twelve Talaromyces species produce determinate or indeterminate synnemata, but T. rufus can be easily distinguished from them by its red synnemata. Phylogenetically, T. rufus is related to T. macrosporus ; however, T. macrosporus produces broadly ellipsoidal ascospores and does not produce synnemata.

Etymology.

Latin, rufus , refers to its red synnemata.

Figures

Figure 11. Talaromyces rufus CBS 141834 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 synnemata on MEA after 1 wk incubation c, d conidiophores and conidia e ascomata f, g ascospores. Scale bars: 200 μm (b), 10 μm (c, d, f), 50 μm (e), 2 μm (g).