A comparison between Scolecobasidium constrictum Abbott and Heterosporium terrestre Atkinson shows them to be conspecific. The genus Scolecobasidium is preferred over Heterosporium for the disposition of this species. S. terreum Abbott is redescribed, and S. humicola and S. variabile described as new species.
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Barron et al. (1962) studied this question.
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