Tubeufia tratensis Y.Z. Lu, J.C. Kang & K.D. Hyde
Index Fungorum number: IF 554912; Facesoffungi number: FoF 04818
Etymology: “tratensis” referring to collecting site “Trat”.
Holotype: MFLU 17–1133
Saprobic on decaying wood in a freshwater stream. Sexual morph: Undetermined. Asexual morph: Hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, white. Mycelium composed of partly immersed, partly superficial, hyaline to pale brown, septate, abundantly branched hyphae, with masses of crowded, glistening conidia. Conidiophores macronematous, mononematous, flexuous, cylindrical, branched, septate, 50–110 μm long, 4–5.5 μm wide, the lower part dark brown and the upper part hyaline to pale brown, smooth-walled. Conidiogenous cells holoblastic, mono- to polyblastic, integrated, sympodial, intercalary or terminal, cylindrical, truncate at apex after conidial secession, 12–17 μm long, 4–5 μm wide, hyaline to pale brown, smooth-walled. Conidia solitary, acropleurogenous, helicoid, rounded at tip, 40–50 μm diam. and conidial filament 4–5 μm wide (x̄ = 46 × 4.5 μm, n = 20), 260–305 μm long, coiled 2½–3¼ times, becoming loosely coiled in water, indistinctly multi-septate, guttulate, hyaline, smooth-walled. (Lu et al. 2018)
Culture characteristics: Conidia germinating on water agar and germ tubes produced from conidia within 12 h. Colonies growing on PDA, circular, obviously umbonate, with rough surface, veined and wrinkle, edge entire, reaching 11 mm in 1 week at 28 °C, dark brown in PDA medium. Mycelium superficial and partially immersed, branched, septate, hyaline to pale brown, smooth.
Material examined: THAILAND, Trat, Amphoe Ko Chang, Yuttha Navi Ko Chang Memorial, on submerged decaying wood in a freshwater stream, 27 April 2017, Yong-Zhong Lu, TW03–4 (MFLU 17–1133, holotype; HKAS 100804, isotype), ex-type living cultures, MFLUCC 17–1993, TBRC 8894.
Notes: Tubeufia tratensis is morphologically similar to T. abundata in conidiophores which are flexuous, cylindrical, branched, the lower part dark brown and the upper part hyaline to pale brown. However, T. tratensis differs from T. abundata by its larger-sized conidia (40–50 × 260–305 μm vs. 27–38 × 180–210 μm). Tubeufia tratensis grouped within Tubeufia species but constitutes an independent lineage with high bootstrap support and phylogenetic result supports it as a distinct species in the genus. (Lu et al. 2018)
Freshwater distribution: Thailand (Lu et al. 2018)