A new species of Trichoglossum (Geoglossales, Ascomycota) from Thailand Author Ekanayaka, Anusha H. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China & Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand Author Hyde, Kevin D. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China & Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand Author Jones, E. B. Gareth Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, 50200, Thailand Author Zhao, Qi Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China Author Elgorban, Abdallah M. Author Bahkali, Ali H. text Phytotaxa 2017 2017-08-04 316 2 161 170 http://dx.doi.org/10.11646/phytotaxa.316.2.5 journal article 10.11646/phytotaxa.316.2.5 1179-3163 13699997 Trichoglossum septatum Ekanayaka, Q. Zhao & K.D. Hyde , sp. nov . ( Fig. 2 ) Index Fungorum number : IF552945 Facesoffungi number : FoF 03236 Etymology:—The specific epithet septatum refers to the ascospore septation. Holotype :— Thailand , Chiang Mai Province , on soil, November 18, 2016 , H. Maoqiang HD058 ( MFLU 17– 0283 ). Diagnosis:—Apothecia club-shaped, black. Hymenium composed of blackish-brown, thick hymenial setae. Asci long, amyloid, 8-spored. Ascospores long, 7 or 15-septate. Description:— Saprobic on soil. Sexual morph : Apothecia 2–4 mm diam. × 18–35 mm high, scattered, stipitate, slender, clavate, oval or dumbbell-shaped, hirsute, black, ascogenous portion and sterile portion are clearly distinguishable. Ascogenous portion flattened clavate to lanceolate, sometimes curved, black, densely hirsute with setae. Sterile portion cylindrical or flexuous, densely hirsute from setae, concolorous with fertile part. Ascomatal core composed of brownish cells of textura epidermoidea . Hymenial setae 400–600 × 15–25 μm ( x = 520 × 21 μm, n=20), blackish-brown, acuminate, tapered at the apex and base, thick-walled, septate, sometimes protruding above hymenium. Paraphyses 7–9 μm ( x = 8.2 μm, n=20) wide at the apices, numerous, filiform, septate, apically enlarged and curved, light brown at the base and darker at the apex, walls granulate. Asci 300–410 × 25–40 μm ( x = 341 × 32 μm, n=20), 8-spored, cylindrical-clavate, narrowed below, apex rounded, amyloid, arising from croziers. Ascospores 190–270 × 7–9 μm ( x = 230 × 8.5 μm, n=30), light brown when immature and greenish-brown to dark brown at maturity, fusoid to fusoid-clavate, immature spores aseptate, mature spores 7 or 15-septate, single ascus can have spores with both variations in the number of septation, guttulate. Asexual morph : Unknown. Material examined:— THAILAND . Chiang Mai Province , Mae-Tang district, (Mushroom research center) MRC, on soil, 18 November 2016 , H. Maoqiang HD058 (MFLU 17–0283). Notes:— Trichoglossum septatum is characterized by having larger asci and ascospores and immature ascospores that are light brown and aseptate, while the mature ascospores are dark brown and 7 or 15-septate ( Table 2 ). Trichoglossum septatum is morphologically and phylogenetically close to T. hirsutum . However, they differ in asci and ascospore sizes ( Table 2 ).