Ophioceras dolichostomum

Figure. Ophioceras dolichostomum (CBS114926). A–B. Ascomata. C–E. Asci. F. Paraphysis. G–H. Ascospores. Scale bars: A–B = 200 µm; C–H = 10 µm.

Ophioceras dolichostomum (Berk. & M.A. Curtis) Sacc., Syll. fung. (Abellini) 2: 358 (1883).
MycoBank: MB146613.
        ≡ Sphaeria dolichostoma Berk. & M.A. Curtis, in Berkeley, J. Linn. Soc., Bot. 10(no. 46): 388 (1868).

Ascomata perithecial, immersed, solitary to gregarious, globose to subglobose, dark brown to black, 400–600 µm diam, with a cylindrical, dark brown to black neck, 1000–1600 × 80–120 µm. Paraphyses unbranched, septate hyaline. Asci 8-spored, unitunicate, clavate, 90–130 × 8–12 µm, with a refractive ring. Ascospores parallel in ascus, filiform to fusiform, slightly curved, 5–7-septate, not constricted at septum, hyaline to yellowish, smooth, 80–115 × 2–3.5 µm. Asexual state unknown.

Typification: Holotype K(M) Wright 541, K(M) Wright 580. Isotype NY No.856, Fungi Cubenses Wrightiani, C. Wright.

Gene sequences: JX134663 (18S), JX134677 (ITS), JX134689 (28S), JX134717 (MCM7), JX134731 (RPB1), JX134703 (TEF1).

Genome sequences: SRX798611 (genome).

Specimen examined: China, Hong Kong, New Territories, Bride’s Pool, from a submerged wood, 18 Mar. 1999, K.D. Hyde, HKUCC3936 (culture CBS114926).

Hosts/substrates: On submerged palms (Archontophoenix, Arecaceae) and wood.

Distribution: Australia, China (Hong Kong), Costa Rica, Cuba, Japan, Seychelles, 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.