Calothrix pilosa Harvey, 1858a: 106–107, pl. XLVIII.C (type locality: Key West, Florida, U.S.A.).—Bornet & Flahault, 1886a [1886–1888]: 363–364.— Jadin, 1894: CLXXII.— Forti, 1907: 614–615.— Sigee, 1966: 68.— Tsuda & Newhouse, 1966: 94.— Rhyne, 1971: 48.— Hackett, 1977: 11.
INDIAN OCEAN DISTRIBUTION: Diego Garcia Atoll, Maldives, Mauritius.
Note: Drouet (1973: 39, 77) chose a specimen in K (in BM) as the lectotype of this species and assigned it to Scytonema hofmannii C. Agardh.