New section and species in Talaromyces Author Sun, Bing-Da China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China & State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China https://orcid.org/0000-0003-0272-6422 Author Chen, Amanda J. China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China https://orcid.org/0000-0001-5294-9574 Author Houbraken, Jos Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands Author Frisvad, Jens C. Department of Biotechnology and Biomedicine, Technical University of Denmark, Kongens Lyngby, Denmark Author Wu, Wen-Ping Novozymes China, No. 14, Xinxi Rd, Shangdi, Beijing, China Author Wei, Hai-Lei Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China https://orcid.org/0000-0001-6554-009X Author Zhou, Yu-Guang China General Microbiological Culture Collection Center, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China Author Jiang, Xian-Zhi Microbiome Research Center, Moon (Guangzhou) Biotech Ltd., Guangzhou 510535, China jxz@moonbio.com Author Samson, Robert A. Westerdijk Fungal Biodiversity Institute, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands r.samson@wi.knaw.nl text MycoKeys 2020 68 75 113 http://dx.doi.org/10.3897/mycokeys.68.52092 journal article http://dx.doi.org/10.3897/mycokeys.68.52092 1314-4049-68-75 BBED0AD34D38552BA75860CC3EDB4AEE Talaromyces tenuis B.D. Sun, A.J. Chen, Houbraken & Samson sp. nov. Fig. 5 Typus. China , Guizhou, soil, 2014, isolated by X.Z. Jiang, Holotype CBS H-22838, culture ex-holotype CBS 141840 = DTO 340-G9. ITS barcode. MN864275. Alternative identification markers: BenA = MN863344, CaM = MN863321, RPB2 = MN863333. Diagnosis. Talaromyces tenuis produces hyaline, thin conidiophores, yellow mycelium on MEA and OA, and grows very restrictedly on CYA, YES and DG18. In. Talaromyces section Tenues Colony diam, 7 d (mm). CYA 7-8; CYA 30 °C 5-8; CYA 37 °C No growth; MEA 18-20; MEA 30 °C 10-11; OA 12-14; YES 9-10; CREA No growth; CYAS No growth; DG18 2-3. Colony characters. CYA 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white; texture floccose; sporulation absent; soluble pigments absent; exudates absent; reverse white. MEA 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium sulphur yellow (15) or ochreous (44); texture floccose; sporulation sparse; conidia en masse white or greyish yellow-green (68); soluble pigments absent; exudates absent; reverse ochreous (44) to umber (9). YES 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white; texture floccose; sporulation absent; soluble pigments absent; exudates absent; reverse buff (45). DG18 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium white; texture floccose; sporulation absent; soluble pigments absent; exudates absent; reverse white. OA 25 °C, 7 d: Colonies moderately deep, plane; margins entire; mycelium pale luteous (11); texture floccose; sporulation absent; soluble pigments absent; exudates absent; reverse buff (45). Figure 5. Talaromyces tenuis CBS 141840T 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 ). Micromorphology. Conidiophores monoverticillate or biverticillate, stipes smooth, 80-150 x 2-3 μm ; metulae 2-3, divergent, 8-9 x 2-2.5 μm ; phialides 2-3, acerose, 8-9.5 x 2-2.5 μm ; conidia smooth, globose to subglobose, 2-3 x 2-2.5 μm . Ascomata not observed. Note. Talaromyces tenuis is phylogenetically distinct and is basal to species belonging to sections Talaromyces and Helici (Fig. 1 ). In a nine-gene phylogeny, it is sister to sections Purpurei and Trachyspermi ( Houbraken et al. 2020 ). This species is characterized by hyaline, thin conidiophores, and grows very restrictedly on CYA, YES and DG18; colonies on MEA and OA have prominent yellow mycelia. Etymology. Latin, tenuis , refers to its thin conidiophores.