Tubeufia hyalospora Y.Z. Lu, Boonmee & K.D. Hyde
Index Fungorum number: IF552220; Facesoffungi number: FoF02361
Etymology: ‘hyalospora’ referring to hyaline helicospores of asexual morph.
Holotype: MFLU 16-1135
Saprobic on decaying woody in flowing freshwater stream. Mycelium partly immersed, partly superficial, composed of pale brown, septate, sparsely branched hyphae, with masses of crowded conidia. Sexual morph Undetermined. Asexual morph hyphomycetous; helicosporous. Conidiophores pale brown, macronematous, erect, short, smooth-walled. Conidiogenous cells monoblastic, integrated, each with single conidium. Conidia 16–33 μm diam., conidial filament 3–5 μm wide (x̄ = 22 × 4 μm, n = 20), 110–225 μm long, coiled 2½–3½ times, rounded at apical end, multi-septate, slightly constricted at septa, hyaline, smooth-walled.
Culture characteristics: Conidia germinating on water agar (WA) within 12 h and germ tubes produced from conidia. Colonies growing on malt extract agar (MEA), reaching 26 mm in 3 weeks at 28 °C, with an undulate edge, pale brown to brown, dark brown, white at margin. Mycelium superficial and partially immersed, branched, septate, hyaline to pale brown, smooth.
Material examined: THAILAND, Prachuap Khiri Khan, Bang Sapan, Ron Thai, on decaying wood in flowing freshwater stream, 30 July 2015, K.D. Hyde, TF03 (MFLU 16-1135, holotype); ex-type living culture, MFLUCC 15-1250, TBRC.
Notes: Tubeufia hyalospora grouped within the Tubeufia clade but did not cluster with any known species (Hyde et al. 2016). Tubeufia hyalospora forms an asexual morph on the natural substrate, which is morphologically similar to T. tectonae (Doilom et al. 2016). Its conidia (diam. 16–33 μm) are narrower than those of T. tectonae (32–55 μm) and are tightly coiled, but in T. tectonae most are loosely coiled or uncoiled. (Hyde et al. 2016)
Freshwater distribution: Thailand (Hyde et al. 2016)