Abstract
Riccia moenkemeyeri was twice described by Stephani (1887, 1891), the second time as R abnormis. Amell (1952) described it as R. undulata. It is clearly a plastic species (Jones 1957) and is widely distributed in tropical Africa, from Sierra Leone (as R. undulata), Nigeria, Cameroon and into the Congo Basin. Until recendy, Sim’s specimens from the Matopos in Zimbabwe, were the most southerly records known, but the species has now also been collected in southern Africa, just east of Pretoria and at Kransberg, in the western Transvaal.
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