Plocamium glomeratum J. Agardh, 1851 [1851–1863]: 397 (type locality: Cape of Good Hope, South Africa).—Isaac, 1956a: 185.— Isaac, 1957b: 99.— Isaac, 1958: 20.— Pocock, 1958: 26.— Simons, 1964a: 183–185, figs. 1a–c.— Pichon, 1978: 162, 176, 228, 419.— Farghaly, 1980: 163.— Seagrief, 1980: 26.— Seagrief, 1988: 56, fig. 5:10.
Taxonomic synonym:
* Plocamium subfastigiatum Kützing, 1866: 18, pl. 51: figs. e, f (type locality: "Cap. Natal'').—Barton, 1893: 142.— Delf & Michell, 1921: 111.
Plocamium membranaceum Suhr forma subfastigiatum (Kützing) De Toni, 1900: 593–594 (`subfastigiata').
INDIAN OCEAN DISTRIBUTION: Madagascar, Mozambique, South Africa.
Note: The synonymy was proposed by Simons (1964a: 183).