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Abstract
Five scolecosporous pyrenomycetes collected from freshwater habitats are described as new species of Ophioceras. All five species share the following morphological character states: dark brown to black pigmented ascomata with long, periphysate beaks and peridia of textura angularis; long, tapered, septate paraphyses with apically free ends; unitunicate asci with a cylindrical, chitinoid apical apparatus; asci that separate from the hymenial layer (deciduous) and phragmoseptate, hyaline to lightly pigmented, scolecosporous ascospores. All of the new species and O. leptosporum form soft-rot cavities on wood. The genera Ophioceras and Pseudohalonectria are provisionally placed in the Magnaporthaceae. Ordinal placement remains uncertain.