Symphyosiphon guyanensis Montagne, 1859: 171–172 (type locality: Cayenne, French Guiana).
Scytonema guyanense (Montagne) Bornet & Flahault, 1888 [1885–1889]: 215.—Lawson, 1969: 332.— Lawson, 1980: 20.— Moorjani, 1980b: fig. 2.
INDIAN OCEAN DISTRIBUTION: Kenya, Tanzania.
Note: Drouet (1973: 39, 87), after examining the holotype of this species (in PC), assigned it to Scytonema hofmannii C. Agardh.