Taxonomy and molecular phylogeny of Trametopsis (Polyporales, Basidiomycota) with descriptions of two new species Author Liu, Shun https://orcid.org/0000-0001-9261-4365 Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China Author Sun, Yi-Fei https://orcid.org/0000-0003-3997-3662 Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China Author Wang, Yan Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China Author Xu, Tai-Min Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China Author Song, Chang-Ge Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China Author Chen, Yuan-Yuan College of Forestry, Henan Agricultural University, Zhengzhou, Henan 450002, China Author Cui, Bao-Kai https://orcid.org/0000-0003-3059-9344 Institute of Microbiology, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China cuibaokai@bjfu.edu.cn text MycoKeys 2022 2022-05-31 90 31 51 http://dx.doi.org/10.3897/mycokeys.90.84717 journal article http://dx.doi.org/10.3897/mycokeys.90.84717 1314-4049-90-31 A8330B1386EE5A75BEEBDB125D2E3753 Trametopsis tasmanica B.K. Cui & Shun Liu sp. nov. Figs 5 , 6 Diagnosis. Trametopsis tasmanica is distinguished from T. abieticola by resupinate basidiomata, smaller pores (2-4 per mm) and basidiospores (5.2-6.3 x 1.8-2.2 μm ), and by growing on Eucalyptus sp. Holotype. Australia. Tasmania, Hobart, Mount Wellington, on rotten wood of Eucalyptus sp., 13 May 2018, Cui 16606 (holotype BJFC 029905). Etymology. Tasmanica (Lat.): referring to the species collected from Tasmania in Australia. Fruiting body. Basidiomata annual, resupinate, not easily separated from the substrate, without odour or taste when fresh, becoming corky to fragile and light in weight upon drying; up to 5.5 cm long, 2 cm wide, and 7 mm thick at centre. Pore surface cream to pinkish-buff when fresh, becoming honey-yellow to snuff brown upon drying; pores round to angular, 2-4 per mm; dissepiments slightly thick, entire to lacerate. Context very thin, corky, cream to buff, up to 2 mm thick. Tubes concolorous with pore surface, corky, up to 4 mm long. Figure 5. Trametopsis tasmanica (Holotype, Cui 16606 and paratype, Cui 16607). Scale bar: 1 cm. Hyphal structure. Hyphal system monomitic in context, dimitic in trama; generative hyphae with clamp connections; skeletal hyphae IKI-, CB-; tissues unchanged in KOH. Context. Generative hyphae hyaline, thin- to slightly thick-walled with a wide lumen, occasionally branched, loosely interwoven, 2.7-4 μm in diam. Tubes. Generative hyphae frequent, hyaline, thin-walled, occasionally branched, 2-3 μm in diam.; skeletal hyphae dominant, hyaline, thick-walled with a wide to narrow lumen, occasionally branched, more or less straight, interwoven, 2-3.7 μm in diam. Cystidia and cystidioles absent. Basidia clavate, bearing four sterigmata and a basal clamp connection, 16-19.5 x 3.7-5 µm ; basidioles dominant, similar to basidia but smaller. Figure 6. Microscopic structures of Trametopsis tasmanica (Holotype, Cui 16606) a Basidiospores b Basidia c Basidioles d Hyphae from trama e Hyphae from context. Spores. Basidiospores cylindrical, hyaline, thin-walled, smooth, IKI-, CB-, (5-)5.2-6.3 x (1.7-)1.8-2.2(-2.4) μm , L = 5.84 μm , W = 2.02 μm , Q = 2.66-3.13 (n = 60/2). Type of rot. White rot. Additional specimen (paratype) examined. Australia. Tasmania, Hobart, Mount Wellington, on rotten branch of Eucalyptus sp., 13 May 2018, Cui 16607 (BJFC 029906).