Scytonema seagriefianum Welsh, 1965: 16–17, pl. 4: figs. 6–9 (`seagriefiana') (type locality: mouth of Riet River, Cape Province, South Africa).
INDIAN OCEAN DISTRIBUTION: South Africa.
Note: Drouet (1973: 55, 73) chose a specimen in BM as the lectotype of this species and assigned it to Scytonema hofmannii C. Agardh.