Pleosporales » Astrosphaeriellaceae » Aquatospora

Aquatospora cylindrica

Aquatospora cylindrica W. Dong, H. Zhang & K.D. Hyde,

 

Index Fungorum number: IF557904; Facesoffungi number: FoF09246

Etymology: referring to cylindrical ascospores of this fungus

Holotype: MFLU 18–1534

 

Saprobic on decaying wood submerged in freshwater. Sexual morph: Ascomata 600–650 μm high, 800–900 μm diam., black, scattered or gregarious, superficial, hemisphaerical to conical, base flattened, carbonaceous, with ostiolate papilla. Ostiole central, relatively broad, circular, black. Peridium up to 155 μm at the sides and 65 μm at the base, carbonized, composed of black amorphous layer, whose cells are obscured. Pseudoparaphyses 0.5 μm diam., numerous, trabeculate, filiform, hyaline, sparsely septate. Asci 175–270 × 50–65 μm (x̄ = 225 × 58 μm, n = 10), 8-spored, bitunicate, clavate to narrowly ellipsoidal, straight or slightly curved, with a short pedicel, apically rounded. Ascospores 70–85 × 20–25 μm (x̄ = 77 × 23 μm, n = 10), 2–4-seriate, cylindrical, slightly tapering at two sides, 1-septate, constricted at the septum, hyaline, straight, with four prominent big guttules, thin-walled, smooth, without sheath. Asexual morph: Undetermined. (Description from Dong et al. 2020)

 

Culture characteristics: On PDA, colony circular, reaching 40 mm in 35 days at 25 °C, brown to white from above, dark brown from below, surface rough, dry, raised, edge entire.

 

Material examined: THAILAND, Songkhla Province, on submerged wood in a stream, 10 May 2018, W. Dong, hat146-1 (MFLU 18-1534, holotype), ex-type living culture MFLUCC 18-1287; ibid., hat146-2 (HKAS 105042, isotype), ex-type living culture KUMCC 19–0060.

 

References

Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575

Figure 1. Aquatospora cylindrica (MFLU 18-1534, holotype). a. Appearance of black ascomata on host, b, c. Vertical section of ascoma, d. Structure of peridium, e. Pseudoparaphyses, f–h. Bitunicate asci, i–k. Ascospores, k. Ascospore in Indian Ink, l. Germinated ascospore, m, n. Colony on PDA (left-front, right-reverse). Scale bars: c = 200 μm, d, f–l = 50 μm, e = 20 μm. (Images from Dong et al. 2020)

 

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