Gaeumannomyces arxii Hern.-Restr. & Crous, Stud. Mycol. 83: 29 (2016).
MycoBank: MB816890.
Asexual state phialophora-like. On MEA, hyphae branched, septate, hyaline to light brown, smooth, 1–5 μm diam. Conidiophores simple, branched. Conidiogenous cells phialidic, terminal to intercalary, solitary or grouped, cylindrical to lageniform, straight or curved, hyaline to light brown, 6–23 × 2–5 μm, with a cylindrical to conical, refractive collarette, up to 3 μm long, 1.5–3.5 μm wide. Conidia lunate, allantoid, hyaline, 4–10 × 1–2 μm.
Colonies on PDA 7.2 cm diam after 7 days at 25 °C; surface grey olivaceous or greyish sepia; aerial mycelium scarce, white; margin diffuse, uneven; reverse light olivaceous to white greyish. Colonies on MEA 6.4 cm diam after 7 days at 25 °C; surface elevated or flat, cottony, funiculose to velvety; aerial mycelium white; submerged mycelium black; margin diffuse, uneven; reverse center dark or white, white to periphery; colonies on OA 7 cm diam after 7 days at 25 °C, glabrous, white to colorless; submerged mycelium dark; margin diffuse, with uneven zones; reverse white to colorless (Description from Hernández-Restrepo et al., 2016).
Typification: Holotype CBSH-22573. Ex-holotype culture CBS903.73.
Gene sequences: KM484837 (ITS), KM484954 (28S), KM485053 (RPB1), KX306681 (TEF1).
Hosts/substrates: On Pennisetum clandestinum (kikuyu grass), and Stenotaphrum secundatum (buffalo grass) (Poaceae).
Distribution: Australia, USA.
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.