Pleosporales » Tetraplosphaeriaceae » Tetraploa

Tetraploa scheueri

Tetraploa scheueri Kaz. Tanaka & K. Hiray.

Index Fungorum number: IF801979

Basionym: Massarina tetraploa Scheuer, Mycol. Res. 95: 126 (1991)

Synonymy: Tetraplosphaeria tetraploa (Scheuer) Kaz. Tanaka & K. Hiray., Stud. Mycol. 64: 182 (2009)

 

Descriptions from Tanaka et al. (2009) observed from Carex acutiformis leaves:

Sexual morph: Ascomata 180–200 μm high, 150–280 μm diam, scattered, immersed, globose to somewhat pyriform, glabrous to sometimes covered with sparse brown hyphae at sides. Beak 50–80(–100) μm long, 50–75 μm diam, central, papillate to short cylindrical, composed of subglobose to polygonal cells, with hyaline periphyses. Ascomatal wall uniformly 6–12 μm thick, composed of 3–4 layers of polygonal brown cells (3.5–12.5 × 2.5–5 μm). Pseudoparaphyses cellular, 1.5–2.5 μm wide, branched and anastomosed, with septa at 8 to 15 μm intervals. Asci (90–)95–128(–140) × 13–16(–19) μm (av. 109.4 × 14.2 μm, n = 50), numerous, basal, fissitunicate, cylindrical, with a short stipe of 5–15 μm long, with 8 biseriate ascospores. Ascospores (29–)32–41.5(–43) × 4–6(–7) μm (av. 37 × 5.2 μm, n = 50), L/W 6.4–8.1 (av. 7.1, n = 50), narrowly fusiform with acute ends, slightly curved, with a septum supramedian (0.44–0.49; av. 0.47, n = 45) and constricted, hyaline, smooth, with a sheath; sheath entire, narrow, 2–4 μm long at both ends, 1–1.5 μm thick at upper of the septum.

 

Culture characteristics: Not examined. According to Scheuer (1991) this fungus produces Tetraploa aristata as anamorph. The asexual morph on the dried culture specimen (GZU 32-91) examined in this study is as follows: Conidia 30–33 × 23–25 μm (av. 30.8 × 23.3 μm, n = 6), L/W = 1.3, solitary, short cylindrical, pale brown, verrucose, consist of 4 columns of 10–13 μm wide, 4-celled. Appendages 263–350 μm long (av. 295.8 μm, n = 6), 10–13 μm thick at the base, 2–3 μm at the apex, 17–22-septate, pale brown at the base and almost hyaline at the apex, smooth, unbranched, straight.

 

Freshwater distribution: UK (Scheuer 1991)

 

Fig 1. Tetraploa scheueri (Material examined: UK, England, Exeter, Exminster marshes, on leaves of Carex acutiformis, 13 November 1988, Ch. Scheuer, GZU 36-91, holotype of Massarina tetraploa; Dried culture specimen of conidial state grown on MEA, derived from ex-type culture, GZU 32-91). a–f from GZU 36-91, a Ascomata on the host surface, b Section of ascoma, c Peridium, d Pseudoparaphyses, e Ascus, f Ascospores, g, h from GZU 32-91, g Conidia on agar medium, h Conidium. Scale bars: a, g = 500 μm, b = 100 μm, c–f, h = 10 μm (Dong et al. 2020)

 

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. https://doi.org/10.1007/s13225-020-00463-5

Scheuer C (1991) Massarina tetraploa sp. nov., the teleomorph of Tetraploa aristata. Mycol Res 95:126–128 https://doi.org/10.1016/S0953-7562(09)81370-1

Tanaka K, Hirayama K, Yonezawa H, Hatakeyama S, Harada Y, Sano T, Shirouzu T, Hosoya T (2009) Molecular taxonomy of bambusicolous fungi: Tetraplosphaeriaceae, a new pleosporalean family with Tetraploa-like anamorphs. Stud Mycol 64:175–209. https://doi.org/10.3114/sim.2009.64.10

 

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