Ophioceras leptosporum

Figure. Ophioceras leptosporum (ILLS242). A. Ascomata. B–C. Asci. D–E. Ascospores. Scale bars: A = 200 µm; B–E = 10 µm.

Ophioceras leptosporum (S.H. Iqbal) J. Walker, Mycotaxon 11(1): 62 (1980).
MycoBank: MB113924.
        ≡ Gaeumannomyces leptosporus S.H. Iqbal, Trans. Br. mycol. Soc. 58(2): 346 (1972).

Ascomata perithecial, superficial to submerged, solitary to gregarious, globose, dark brown to black, 200–350 µm diam, with a filiform to cylindrical, dark brown to black neck, 800–2200 × 35–70 µm. Paraphyses unbranched, septate hyaline. Asci 8-spored, unitunicate, cylindrical, 75–95 × 5–7 µm, with a refractive ring. Ascospores parallel in ascus, filiform, 3–7-septate, not constricted at septum, hyaline to yellowish, smooth, 55–80 × 1.5–2 µm. Asexual state unknown.

Typification: Isotype ILLS242. Ex-isotype culture CBS894.70.

Gene sequences: JX134664 (18S), JX134678 (ITS), NG057959 (28S), JX134718 (MCM7), JX134732 (RPB1), JX134704 (TEF1).

Genome sequences: SRX798632 (transcriptome).

Specimens examined: UK, England, Exeter, River Creek near Cowley Bridge., on dead submerged stems of Apiaceae, 6 Feb. 1970, S.H. Iqbal, 57368 (ILLS242, culture CBS894.70). USA, Illinois, Union, Pine Hills Swamp Nature Preserve, on submerged, decayed stems, 5 May. 1977, J.L. Crane and J.D. Schoknecht 37175 (ILLS163261).

Hosts/substrates: On rotten, submerged stems and leaves.

Distribution: China, Malaysia, UK (England), USA (Illinois).

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.