Kirschsteiniothelia elaterascus, a new species from freshwater habitats, is described. This fungus has all the characteristics of the genus Kirschsteiniothelia including mammiform, black ascomata, cellular pseudoparaphyses, fissitunicate asci, and brown, one-septate, verruculose ascospores with a gelatinous sheath. It differs from all other species in the genus in having an endoascus with a long coiled base that uncoils during ascus dehiscence. Sphaeria aethiops, the basionym of the species that typifies Kirschsteiniothelia, is lectotypified.
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Carol A. Shearer (1993) studied this question.