Abstract
Naturally occurring transitional stages between Rosenvingiella polyrhiza (Rosenv.) Silva and Prasiola from Co. Durham indicate that the former may not be an autonomous species. The Prasiola conforms to the description of P. calophylla (Carmich.) Menegh. which may be an aerial ecophene of P. stipitata Suhr in Jessen. Since the former specific epithet has priority, the name P. stipitata may be invalid. A pluriseriate form of Rosenvingiella is described also, with putative male and female gamete-forming cells.

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