Figure. Gaeumannomyces oryzinus (BPI 626741). A. Ascomata. B–C. Asci. D–E. Ascospores. Scale bars: A = 200um; B–E = 10µm.
Gaeumannomyces oryzinus (Sacc.) Schrantz, Bull. trimest. Soc. mycol. Fr. 76(4): 337 (1961).
MycoBank: MB331025.
≡ Ophiobolus oryzinus Sacc., G. bot. ital., n.s. 23(2): 203 (1916).
≡ Linocarpon oryzinum (Sacc.) Petr., Sydowia 6(5-6): 387 (1952).
≡ Gaeumannomyces oryzinus (Sacc.) Schrantz, Bull. trimest. Soc. mycol. Fr. 76(4): 337 (1961).
Morphological description: Ascomata perithecial, superficial or submerged, solitary or gregarious, dark brown to black, 200–400µm in diam, with a cylindrical, hyaline to brownish neck, 100–300 × 50–80 µm. Paraphyses hyaline, septate, dissolving at mature. Asci unitunicate, clavate, 8-spored, 90–135 × 13–20 µm, with a refractive ring. Ascospores parallel in the ascus, hyaline to yellowish, long fusiform to filiform, straight or slightly curved, 0–5-septate, not constricted at the septum, smooth, 90–115 × 3–6 µm.
Conidiophores solitary, erect, straight or curved, unbranched or sparsely branched, hyaline, smooth. Conidiogenous cells phialidic, erect, terminal or intercalary, hyaline, smooth, 7–20 × 2–6 µm, 2–3.5 µm, with a cylindrical collarette, 1–3 × 1–2 µm. Conidia, lunate, allantoid to fusiform, straight to curved, hyaline, smooth, aseptate, 5–9 × 1–3 µm.
Material examined: China, Hong Kong, on Oryza sativa, 14 Apr. 1975, S. Jordan, BPI 626742. USA, Arkansas, Ahuyna, on Oryza sativa, 8 Oct. 1928, E.C. Zieller, BPI 626741.
Pathogenicity: Gaeumannomyces oryzinus was reported from rooting roots and culms mainly on rice (Oryza sativa), but was also found on Bermuda grass (Cynodon sp.) as well.
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: China, Hong Kong. USA, Arkansas.