Tubeufiales » Tubeufiaceae » Tubeufia

Tubeufia aquatica

Tubeufia aquatica Z.L. Luo, Bhat & K.D. Hyde

Index Fungorum number: IF 818827; Facesoffungi number: FoF 02649

Holotype: MFLU 16–2544


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, unbranched, 0–1-septate, 18–40 μm long, 4–5 μm wide, pale brown, smooth-walled. Conidiogenous cells holoblastic, mono- to polyblastic, integrated, sympodial, terminal, cylindrical, truncate at apex after conidial secession, denticulate, 12–23 μm long, 4–5 μm wide, pale brown, smooth-walled. Conidia solitary, acrogenous, helicoid, rounded at tip, 21–25 μm diam. and conidial filament 4.5–6 μm wide ( = 22 × 5 μm, n = 50), 80–115 μm long, coiled 1½–2¼ times, not becoming loose 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, irregular, with flat surface, edge undulate, reaching 22 mm in 4 weeks at 28 °C, pale brown to brown in MEA medium. 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, 31 December 2016, Yong-Zhong Lu, CR08 (MFLU 17–1091 = HKAS 100761), living cultures, MFLUCC 17–1794, TBRC.


Notes: Phylogenetically, our newly obtained isolate nests within Tubeufia aquatica (MFLUCC 16–1249 and DLUCC 0574) with high bootstrap support, which indicates that they are conspecific (Lu et al. 2018). Therefore, we identify our new collection as Tubeufia aquatica. It is necessary to point out that our new collection is characterized by 0–1-septate conidiophores which is morphologically distinct from the previously described T. aquatica (Luo et al. 2017).


Freshwater distribution: China (Luo et al. 2017), Thailand (Lu et al. 2018b; Dong et al. 2020)