Sphaerococcus isiformis C. Agardh, 1822 [1822–1823]: 271 (type locality: West Indies).
Gigartina ? isiformis (C. Agardh) Greville, 1830: lix.—Kützing, 1868: 3, pl. 7: figs. c, d.
Eucheuma isiforme (C. Agardh) J. Agardh, 1847: 16.
Note: Kützing gave "In mari indico'' as the provenance of the specimen illustrated in his Tabulae, but this indication is obviously an error since he previously (1849: 777) gave the distribution of the species as "In mari Indiae occidentalis''.