Tubeufia sympodihylospora Y.Z. Lu, J.C. Kang & K.D. Hyde
Index Fungorum number: IF 554909; Facesoffungi number: FoF 04764; Fig. 75
Etymology: “sympodi-” referring to sympodial conidiogenous cells of this fungus; “hylospora” referring to hyaline helicoid conidia.
Holotype: HKAS 97427
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, 40–90 μm long, 5–7 μm wide, hyaline to pale brown, smooth-walled. Conidiogenous cells holoblastic, mono- to polyblastic, integrated, sympodial, intercalary or terminal, cylindrical, repeatedly geniculate, truncate at apex after conidial secession, 8–16 μm long, 5–6 μm wide, hyaline to pale brown, smooth-walled. Conidia solitary, acropleurogenous, helicoid, rounded at tip, 55–70 μm diam. and conidial filament 5–7 μm wide (x̄ = 62 × 6 μm, n = 20), 310–370 μm long, loosely coiled 1¾–2¼ times, becoming loose in water, indistinctly multi-septate, guttulate, hyaline. (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, with flat surface, edge entire, reaching 28 mm in 4 weeks at 28 °C, brown to dark 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, JHC12–1 (HKAS 97427, holotype; GZAAS 16–0055, isotype), ex-type living cultures, MFLUCC 17–0044, GZCC 16–0043, TBRC 8893; Ibid., JHC16–2 (GZAAS 16–0061, paratype), living culture, GZCC 16–0049; Ibid., JHC17–3 (GZAAS 16–0063, paratype), living culture, GZCC 16–0051.
Notes: Morphologically, Tubeufia sympodihylospora is similar to T. sympodiophora in having holoblastic, sympodial conidiogenous cells with a truncate apex after conidial secession but can be easily recognized by its loosely helicoid conidia. Besides, T. sympodihylospora differs from T. sympodiophora in having shorter conidiophores (40–90 μm vs. 120–300 μm). Phylogenetically, T. sympodihylospora shares a sister relationship to Tubeufia xylophila with high bootstrap support and can be considered as distinct species. (Lu et al. 2018)
Freshwater distribution: China (Lu et al. 2018)