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A b s t r a c t A revision o f the genus Ceramium in South Africa has been undertaken. The morphology o f the genus is discussed, and a key to the ten species which are recognised is provided. The following new taxa and new com binations are published: Ceramium arenarium, C. papenfussianum, C. diaphanum (Lightf.) Roth var. capense, -var. pulchellum (K uetz.) (Hormoeeras pulchellum Kuetz.), C. centroceratiforme.Ceramium capense Kuetz., which was transferred to Microcladia by Papenfuss, is regarded as belonging to Ceramium.

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Trematocarpus Kiitzing in southern Africa is found to comprise four taxa in three species: newly described is T. fragilis (Ag.) De Toni var. divaricatus Simons, var. nov. Two of the species, T. flabellatus (J. Ag.) De Toni and T. affinis (J. Ag.) De Toni are restored to independent specific rank after being regarded as synonyms of T. scutellatus (Her.) Searles. It is shown that Sphaerococcus (Chondrus) scutellatus Her., the basionym of T. scutellatus refers to a species of Gigartina, therefore a new combination Gigartina scutellata (Her.) Simons is made for this species which was formerly known as G. fastigiata J. Ag. and G. scabiosa (Kiitz.) Papenf. Trematocarpus elongatus Kiitz. is relegated to synonymy under T. fragilis var. divaricatus. RESU M E L E G E N R E TREMATOCARPUS (S A R C O D IA C E A E , R H O D O P H Y T A ) EN A F R IQ U E D E SUD ET E X C LU S IO N D E SPHAEROCOCCUS (CHONDRUS) SCUTELLATUS

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