Tubeufia fangchengensis Y.Z. Lu, J.C. Kang & K.D. Hyde
Index Fungorum number: IF 554902; Facesoffungi number: FoF 04757
Etymology: “fangchengensis” referring to collecting site.
Holotype: HKAS 97429
Saprobic on decaying wood in a freshwater stream. Sexual morph Undetermined. Asexual morph Hyphomycetous, helicosporous. Colonies on the substratum superficial, effuse, gregarious, white to pale brown. 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, 30–135 μm long, 3–5 μm wide, hyaline to pale brown, smooth-walled. Conidiogenous cells holoblastic, mono- to polyblastic, integrated, sympodial, intercalary or terminal, cylindrical, truncate at apex after conidial secession, 7–13 μm long, 2.5–3.5 μm wide, hyaline to pale brown, smooth-walled. Conidia solitary, acropleurogenous, helicoid, rounded at tip, 20–40 μm diam. and conidial filament 2.5–4 μm wide (x̄ = 30 × 3 μm, n = 20), 165–220 μm long, coiled 1½–2½ 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 24 h. Colonies growing on PDA, circular, with flat surface, edge entire, reaching 25 mm in 3 weeks at 28 °C, pale brown to brown in PDA medium. Mycelium superficial and partially immersed, branched, septate, hyaline to pale brown, smooth.
Material examined: CHINA, Guangxi Province, Fangchenggang City, on submerged decaying wood in a freshwater stream, 15 May 2016, Yong-Zhong Lu, JHC14–4 (HKAS 97429, holotype; GZAAS 16–0059, isotype), ex-type living cultures MFLUCC 17–0047, GZCC 16–0047, TBRC 8897.
Notes: Tubeufia fangchengensis is morphologically similar to Tubeufia parvispora with flexuous, cylindrical, branched, pale brown conidiophores. However, T. fangchengensis can be recognized from T. parvispora by its larger-sized conidia (20–40 × 165–220 μm vs. 15–20 × 105–155 μm). Our multi-gene phylogenetic analysis supports that T. fangchengensis as a distinct Tubeufia species (Lu et al. 2018).
Freshwater distribution: China (Lu et al. 2018)