Conferva ambigua J. Hooker & Harvey, 1845a: 295 (type locality: Christmas Harbor, Kerguelen).
Rhizoclonium ambiguum (J. Hooker & Harvey) Kützing, 1849: 387.—Schröder, 1912: 295.— Lawson, 1980: 15.— Farrell, Critchley, & Aken, 1993: 149.
INDIAN OCEAN DISTRIBUTION: Kenya, South Africa.