Dothideomycetes » Dothideomycetes, genera incertae sedis » Myriostigmella

Myriostigmella guatteriae

Myriostigmella guatteriae (G. Arnaud) G. Arnaud, Bull. trimest. Soc. mycol. Fr. 68: 221 (1952).

           Index Fungorum number: IF 431814; Facesoffungi number: FoF 12330, Fig. 1

Description:

Parasitic or saprobic on host. Sexual morph: Ascomata 97–180 µm diam., 60–110 µm high, circular, scattered, flattened, superficial, carbonaceous, brittle, black. Peridium 8–15 µm thin, 1-layer, dark brown, comprising cells of textura angularis. Hamathecium 2.5–3.5 µm of dense, septate hyaline to light brown cellular pseudoparaphyses. Asci 40–55 µm × 20–25 µm (x̅ = 44.5 × 23.5 µm, n = 10), 8-spored, bitunicate, fissitunicate, oblong to obclavate, small pedicel, with distinct ocular chamber. Ascospores 19–22 µm × 5–7.5 µm (x̅ = 20.9 × 5.8 µm, n = 10), partially overlapping, with broadly rounded ends, hyaline to pale brown,uniseptate, slightly constricted at the septum, with upper cell shorter than the lower cell, smooth-walled. Asexual morph: Unknown.

Material examined: The United States, Florida, Alachua, Gainesville, San Felasco Hammock, on grass, 20 January 1982, Anne Barkdoll (FLAS-F-54626).

Fig. 1 Myriostigmella guatteriae (FLAS-F-54626). a–d Herbarium material. e Section through ascoma. f Squash mount of ascoma. g Peridium. h Cellular pseudoparaphyses. i–m Asci. n–q Ascospores. Scale bars: c = 2000 μm, d = 500 μm, e = 200 μm, f, g, i–m = 20 μm, h, n–q = 10 μm.

Importance and distribution

Myriostigmella comprises only one species described on grass in The United States (Florida).

 

References

Arnaud G. 1952 – Mycologie concrète: genera. Bulletin de la Société Mycologique de France 68, 179–223.

Kirk PM, Stalpers JA, Braun U, Crous PW et al. 2013 – A without-prejudice list of generic names of fungi for protection under the International Code of Nomenclature for algae, fungi, and plants. IMA fungus 4, 381–443.

Lumbsch HT, Huhndorf SM. 2010 – Outline of Ascomycota–2009. Fieldiana Life and Earth Sciences 1, 1–60.

Wijayawardene NN, Hyde KD, Al-Ani LKT, Tedersoo L et al. 2020 – Outline of Fungi and fungi-like taxa. Mycosphere 11, 1060–1456.

Wijayawardene NN, Hyde KD, Rajeshkumar KC, Hawksworth DL et al. 2017– Notes for genera: Ascomycota. Fungal Diversity 86, 1–594.

 

 

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