Asperocaulon collabens Rudolphi, 1831: 178 (type locality: Table Bay or Gordons Bay, Cape Province, South Africa fide Papenfuss, 1968b: 269).
Aristothamnion collabens (Rudolphi) Papenfuss, 1968b: 268.—Wollaston, 1984: 286.— Bolton, 1986: 253.— Stegenga & Bolton, 1992: fig. 3, table I.
Taxonomic synonym:
Phlebothamnion purpuriferum Kützing, 1849: 656 (type locality: Table Bay, Cape Province, South Africa).
Callithamnion purpuriferum (Kützing) J. Agardh, 1851 [1851–1863]: 59.—G. Murray, 1887: 22.— S. Dixit, 1970: 122.
INDIAN OCEAN DISTRIBUTION: South Africa, Sri Lanka.
Note: The synonymy was proposed by Papenfuss (1968b: 268).