Tubeufia brunnea Y.Z. Lu, J.C. Kang & K.D. Hyde
Index Fungorum number: IF 554898; Facesoffungi number: FoF 04752
Etymology: “brunnea” referring to brown colonies and brown helicoid conidia of this fungus.
Holotype: MFLU 17–1211
Saprobic on decaying wood in a freshwater stream. Sexual morph Undetermined. Asexual morph Hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, brown. Mycelium composed of partly immersed, partly superficial, subhyaline to pale brown, septate, branched hyphae, with a few of glistening conidia. Conidiophores macronematous, mononematous, cylindrical, branched, 0–1-septate, 20–30 μm long, 3.5–5 μm wide, hyaline to pale brown, smooth-walled. Conidiogenous cells holoblastic, monoblastic, integrated, sympodial, terminal, cylindrical, truncate at apex after conidial secession, 12–18 μm long, 2.5–5 μm wide, hyaline to pale brown, smooth-walled. Conidia solitary, acrogenous, helicoid, rounded at tip, 35–45 μm diam. and conidial filament 7–9 μm wide in the broadest part (x̄ = 40 × 8 μm, n = 20), tapering to 3–4 μm wide near the ends, 170–250 μm long, tightly coiled 1½–2½ times, not becoming loose in water, indistinctly multi-septate, guttulate, hyaline when young, pale brown when aged, 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, umbonate surface, edge entire, reaching 35 mm in 1 month at 28 °C, pale brown to brown. Mycelium superficial and partially immersed, branched, septate, hyaline to pale brown, smooth.
Material examined: THAILAND, Chiang Rai, Muang, Ban Nang Lae Nai, on submerged decaying wood in a freshwater stream, 25 March 2017, Yong-Zhong Lu, CR41 (MFLU 17–1211, holotype; HKAS 100777, isotype), ex-type living culture, MFLUCC 17–2022.
Notes: Morphologically, Tubeufia brunnea can be easily recognized from other Tubeufia species by its subhyaline to pale brown colonies on natural woody substrate and conidia tapering to narrow ends. Phylogenetically, Tubeufia brunnea shares a sister relationship to T. hechiensis and T. taiwanensis with high bootstrap support and support that they are distinct species (Lu et al. 2018).