Ophioceras arcuatisporum

Figure. Ophioceras arcuatisporum (ILLS57383). A–B. Ascomata. C–E. Asci. F–G. Ascospores. Scale bars: A–B = 200 µm; C–G = 20 µm.

Ophioceras arcuatisporum Shearer, J.L. Crane & W. Chen, Mycologia 91(1): 146 (1999).
MycoBank: MB450115.

Ascomata perithecial, immersed, solitary to gregarious, globose to subglobose, black, 250–350 µm diam, with a cylindrical, dark brown to black, hairy neck, 500–800 × 100–175 µm. Paraphyses unbranched, septate, hyaline. Asci 8-spored, unitunicate, clavate, 250–300 × 13–25 µm, with a refractive ring. Ascospores parallel in ascus, filiform to fusiform, slightly curved, hyaline to light brown, 5–12-septate, not constricted at septum, smooth, 150–225 × 4–7.5 µm. Asexual state unknown.

Typification: Holotype ILLS57383. Paratypes ILLS57371, ILLS57370.

Gene sequences: Unknown.

Specimens examined: USA, Minnesota, Clearwater County, Elk Lake, Lake Itasca, Lake Itasca State Park, on Typha, 22 Oct 1993, J.L. Crane and C.A. Shearer, A-167-1 (ILLS57383); ibid., St. Louis County, Shagawa Lake, on submerged herbaceous debris,23 Oct 1993, J.L. Crane and C.A. Shearer, A-167-2 (ILLS57371). Canada, Manitoba, Lake Rosabella, Akudlik Marsh Churchill, on submerged grasses, 25 Jul. 1992, J.L. Crane and C.A. Shearer, A-9-1 (ILLS57370).

Hosts/substrates: On submerged herbaceous debris.

Distribution: Canada (Manitoba), USA (Minnesota).

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.