Canadian and some extralimital <i>Ophiobolus</i> species

Descriptions and illustrations are given for 31 species of Ophiobolus. Two allied species of Lulworthia, and Gaeumannomyces graminis are briefly contrasted. Ophiobolus species now recorded in Canada are O. acuminatus (Sow. ex Fries) Duby in Rab., O. anguillidus (Cooke in Cooke &amp; Ellis) Sacc., O. cesatianus (Mont, ex Ces. &amp; De Not.) Sacc., O. collapsus Ellis &amp;Sacc., O. drechsleri n.sp., O. erythrosporus (Riess in Rab.) Winter in Rab., O. fulgidus (Clinton &amp; Peck in Peck) Sacc., O. galii Richon, O. herpotrichus (Fries) Sacc., O. mathieui (West.) Sacc., O. minor Bubak, O. niesslii Bäumler, O. prunellae (Ellis&amp; Ev.) n. comb., O. rubellus (Pers. ex Fries) Sacc., and O. tanaceti (Fuckel) Sacc. Extralimital species include from U.S.A., O. anthrisci (L. Holm) L. Holm, O. castellejae Tracy &amp; Earl in Greene, O. crassus n.sp., O. filiformis (Wehmeyer) n. comb., O. lonicerae Fabre, O. ophioboloides (Sacc.) L. Holm, O. robustus (Strasser) n. comb., and O. vermisporus (Ellis) n. comb.; and from Europe, O. cirsii (Karsten) Sacc., O. compressus Rehm, O. dictamni (Fuckel) Sacc., O. fruticum (Rob. ex Desm.) Sacc., O. megalosporus (Auersw. &amp; Niessl in Niessl) n. comb., O. ponticus Petrak, O. pseudoaffinis Petrak, and O. rudis (Riess) Rehm.

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