Gaeumannomyces graminis (Sacc.) Arx & D.L. Olivier, Trans. Br. mycol. Soc. 35(1): 32 (1952).
MycoBank: MB297567.
≡ Rhaphidophora graminis Sacc., Fungi venet. nov. vel. Crit., Ser. 2: 307 (1875).
≡ Ophiobolus graminis (Sacc.) Sacc., Reliq. Libert 2: no. 134 (1881).
≡ Ophiochaeta graminis (Sacc.) Hara, Journal of Plant Protection, Tokyo 3: 342 (1916).
≡ Gaeumannomyces graminis var. graminis (Sacc.) Arx & D.L. Olivier, Trans. Br. Mycol. Soc. 35: 32 (1952).
= Sphaeria cariceti Berk. & Broome, Ann. Mag. nat. Hist., Ser. 3 7: 455 (1861).
≡ Ophiobolus cariceti (Berk. & Broome) Sacc., Syll. fung. (Abellini) 2: 349 (1883).
≡ Linocarpon cariceti (Berk. & Broome) Petr., Sydowia 6: 387 (1952).
≡ Gaeumannomyces cariceti (Berk. & Broome) Lar.N. Vassiljeva, Nizshie Rasteniya, Griby i Mokhoobraznye Dalnego Vostoka Rossii, Griby. Tom 4. Pirenomitsety i Lokuloaskomitsety (Sankt-Peterburg) 4: 146 (1998).
Morphological description: On MEA, mycelium consisting of septate, branched, smooth, hyaline to pale brown, 1–4 μm diam hyphae. Conidiophores differentiated, branched often verticillate, hyaline, pale brown to brown. Conidiogenous cells phialidic, solitary or grouped, terminal, hyaline to pale brown, cylindrical to lageniform, straight or curved, 7–30 × 1.5–4 μm, with a cylindrical to conical, refractive, collarette up to 3.5 μm long, 1–1.7 μm wide. Conidia lunate, allantoid, hyaline, 4–10 × 1–2 μm. Hyphopodia not observed (Hernández-Restrepo et al. 2016).
Culture characteristics: After 7 d at 25 °C: On PDA reaching 60 mm diam, aerial mycelium scarce to moderate, cottony, olivaceous grey, buff or isabelline, submerged mycelium darker, margin diffuse to rhizoid; reverse centre olivaceous grey, colourless to the periphery. On MEA reaching 62 mm diam, aerial mycelium abundant to moderate, cottony, pale olivaceous grey, darker to the periphery, submerged mycelium dark, margin effuse, rhizoid; reverse fuscous dark, rhizoid to the periphery. On OA reaching 62 mm diam, flat to cottony, greenish grey to grey olivaceous in the centre, white to colourless to the periphery, aerial mycelium moderate to abundant, white, submerged mycelium dark in the centre, margin effuse; reverse pale mouse grey (Hernández-Restrepo et al. 2016).
Specimens examined: Italy, Selva, Treviso, on Cynodon or Agropyron, Oct. 1874, slides as DAR 21032. USA, Florida, isolated from Cynodon dactylon × C. transvaalensis, 1987, M. Elliott, CPC26020 = CBS141384; 1991, M. Elliott, CPC26027; CPC26029; CPC26033 = CBS141385; CPC26035 = CBS141386; 1992, M. Elliott, CPC26039; CPC26042; CPC26045 (Hernández-Restrepo et al. 2016).
Pathogenicity: from Cynodon sp. or Agropyron sp.
References:
Hernández-Restrepo M, Groenewald JZ, Elliott ML, Canning G, McMillan VE, Crous PW. 2016. Take-all or nothing. Studies in Mycology 83:19–48.
Geographical distribution: Italy. USA, Florida.
Copyright 2022 by The American Phytopathological Society. Reproduced, by permission, from Luo, J., and Zhang, N. 2022. The Rice Blast Fungus and Allied Species: A Monograph of the Fungal Order Magnaporthales (https://my.apsnet.org/APSStore/Product-Detail.aspx?WebsiteKey=2661527A-8D44-496C-A730-8CFEB6239BE7&iProductCode=46826). American Phytopathological Society, St. Paul, MN.