Tainosphaeria aquatica X.D. Yu, C.X. Li & H. Zhang, 2021

Li, Chun-Xue, Yu, Xian-Dong, Dong, Wei, Hu, Dian-Ming, Boonmee, Saranyaphat & Zhang, Huang, 2021, Freshwater hyphomycetes in Sordariomycetes: two new species of Tainosphaeria (Chaetosphaeriaceae, Chaetosphaeriales) from Thailand, Phytotaxa 509 (1), pp. 56-68 : 60

Tainosphaeria aquatica X.D. Yu, C.X. Li & H. Zhang , sp. nov. FIGURE 2

Index Fungorum number: IF558386; Facesoffungi number: FoF 09838

Etymology: —In reference to aquatic habitat of the fungus

Holotype: —MFLU 17-1729

Saprobic on decaying wood submerged in freshwater. Sexual morph: undetermined. Asexual morph: hyphomycetous. Colonies superficial, effuse, gregarious, glistening, pale brown, with slimy, subhyaline or yellowish brown conidial mass at the conidiophore apex. Mycelium partly immersed, partly superficial, composed of branched, septate, hyaline to pale brown hyphae. Conidiophores 50–105 μm long, 3–6 μm wide (= 74.5 × 4.4 μm, n = 20), macronematous, mononematous, erect, unbranched, cylindrical with tapering end at the apex, straight or slightly flexuous, pale brown, subhyaline or pale brown in the apical cell, 2–5-septate, smooth-walled. Conidiogenous cells enteroblastic, monophialidic, terminal, with a flared collarette at the apex. Collarettes 2.5–4.5 μm wide at the opening, 2–2.7 μm deep, campanulate, subhyaline to pale brown. Conidia 23–33 × 3.5–6.5 μm (= 28 × 5 μm, n = 30), acrogenous, cylindrical to long fusiform, slightly curved, hyaline, 0–3-septate, guttulate, smooth, often with hair-like, hyaline appendages at both ends, (12.5–)19–26 μm long.

Cultural characteristics:—Colonies on PDA circular, regular, white with brown center in front view, white at the margin, yellow at the middle with brown center in reverse view, surface slightly raised, rough, dry, with an attenuated and radial margin; not producing pigmentation in culture.

Material examined:— THAILAND, Chiang Mai Province, Mushroom Research Centre , on decaying wood submerged in a stream, 1 September 2017, X.D. Yu, 19A ( MFLU 17-1729 , holotype), ex-type living culture, MFLUCC 17-2370 .

Notes:— Tainosphaeria aquatica morphologically fits well with the characteristics of Tainosphaeria in having macronematous, mononematous, unbranched conidiophores, monophialidic conidiogenous cells with collarettes and hyaline, fusiform to cylindrical conidia. The phylogenetic analysis based on a concatenated LSU, ITS and TEF1-α sequence dataset shows that T. aquatica clusters within Tainosphaeria II. Compared with other species in Tainosphaeria II , T. aquatica is distinguishable by its 0–3-septate, larger conidia and longer polar appendages. Therefore, T. aquatica is introduced here as a new species in Tainosphaeria . A comparison of morphological features and habitats of species in Tainosphaeria is provided in TABLE 2 .

Figures

FIGURE 2. Tainosphaeria aquatica (MFLU 17-1729, holotype) a Colonies on natural substratum. b, d Conidiophores bearing conidia. c Conidiophore. e–j Conidia. k Germinating conidium. l, m Colony on PDA (left-front, right-reverse). Scale bars: b = 30 μm, c–k = 20 μm.