Mycosphaerellales » Mycosphaerellaceae » Graminopassalora

Graminopassalora graminis

Graminopassalora graminis (Fuckel) U. Braun, C. Nakash., Videira & Crous, in Videira et al., Stud. Mycol. 87: 308 (2017).

≡ Scolicotrichum graminis Fuckel, Jb. nassau. Ver. Naturk. 23-24: 107 (1870) [1869-70].

Index Fungorum number: IF 822760; Facesoffungi number: FoF 09678, Fig. 1

Description:

Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Mycelium internal, forming stromata of variable shape and size, typically well-developed, substomatal to immersed, brown. Conidiophores 65−80 × 4.1−8.8 µm (x̄ = 70.7 × 7.2 µm, n = 20), aggregated in fascicles, arising from stromata or through stomata, erect, subcylindrical, straight to curved, sinuous, somewhat geniculate, unbranched, septate, pale to dark brown, thin and smooth-walled. Conidiogenous cells 11−18 × 3−8 µm (x̄ = 17.8 × 5.6 µm, n = 20), integrated, terminal, with a single to numerous visible conidiogenous loci, thickened and darkened, typically hardly prominent. Conidia 25−35 × 9−15 µm (x̄ = 31.1 × 10.5 µm, n = 20), formed singly, ellipsoidal or cylindrical, ovoid to obovoid, short obclavate, 0–3-septate, occasionally slightly constricted at the septa, with slightly obtuse apex and base, olivaceous brown to pale brown, thin, smooth sometimes rough walled, hila rounded, thickened and darkened.

Material examined: The United States, Ohio, Logan, West Mansfield, on Alopecurus geniculatus (Poaceae), Kellerman, William Ashbrook, 10 May 1902 (Kell. OhioF.0097).

Fig. 1 Graminopassalora graminis (F. Europaei-2682). a–d Herbarium material. e, f Conidiophores and conidiogenesis. g–m Conidia. Scale bars: c = 1000 μm, d = 500 μm, e, f = 50 μm, g–m = 20 μm.

Importance and distribution

Graminopassalora comprises only one species known on grass leaves in Europe (Germany), Dactylis glomerata (Poaceae) in Asia (Japan), Alopecurus aequalis (Poaceae) in Asia (Republic of Korea). Species of Graminopassalora are pathogenic and cause foliar diseases which shows as leaf spot.

 

References

Videira SIR, Groenewald JZ, Nakashima C, Braun U, Barreto RW, de Wit PJGM, Crous PW. 2017 – Mycosphaerellaceae - Chaos or clarity? Studies in Mycology 87, 257–421.

 

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