Tubeufia parvispora Tibpromma & K.D. Hyde
Index Fungorum number: IF 555292; Facesoffungi number: FoF 04514; Fig. 70
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, 25–133 μm long, 3–5 μm wide, hyaline to pale brown, smooth-walled. Conidiogenous cells holoblastic, mono- to polyblastic, integrated, sympodial, intercalary or terminal, cylindrical, with denticles, arising from the apex cell of conidiophores as tiny tooth-like protrusions, 8–16 μm long, 3–5 μm wide, hyaline to pale brown, smooth-walled. Conidia solitary, acropleurogenous, helicoid, rounded at tip, 15–20 μm diam. and conidial filament 2–3 μm wide (x̄ = 18 × 2.5 μm, n = 20), 105–155 μm long, tightly coiled 2½–3½ times, becoming loosely coiled in water, indistinctly multi-septate, guttulate, hyaline, smooth-walled.
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 26 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: THAILAND, Trat, Amphoe Ko Chang, Yuttha Navi Ko Chang Memorial, on submerged decaying wood in a freshwater stream, 27 April 2017, Yong-Zhong Lu, TW12 (MFLU 17–1143 = HKAS 100814), living cultures, MFLUCC 17–2003, TBRC; Ibid., TW03–3 (MFLU 17–1132 = HKAS 100803), living culture, MFLUCC 17–1992; Ibid., on decaying wood in a mountain, 26 April 2017, Yong-Zhong Lu, TM02 (MFLU 17–1149 = HKAS 100820), living culture, MFLUCC 17–2009.
Notes: Tubeufia parvispora was introduced by Tibpromma et al. (2018). In this study, we report three new collections of Tubeufia parvispora from a freshwater habitat and is the first record of T. parvispora from aquatic habitats. Tubeufia parvispora is morphologically similar to Tubeufia rubra in having flexuous, branched conidiophores with hyaline helicoid conidia becoming loosely coiled in water, but can be recognized by its conidiophores. The conidiophores of T. rubra are repeatedly geniculate and conidiogenous cells truncate at apex after conidial secession, whereas T. parvispora is characterized by tooth-like conidiogenous protrusions arising from the apex cell of conidiophores. Besides, T. parvispora differs from T. rubra in having smaller conidia (15–20 × 105–155 μm vs. 36–49 × 230–370 μm). Phylogenetically, the three newly obtained isolates formed a cluster with high bootstrap support and support that it is a distinct species. (Lu et al. 2018)
Freshwater distribution: Thailand (Lu et al. 2018)