Oscillatoria simplicissima Gomont, 1892b: 219–220, pl. 7: fig. 1 (lectotype locality: Salzburg, Austria fide Drouet, 1968: 281).—Biswas, 1926: 19, pl. VI: fig. 8.— Biswas, 1949b: 19.— Desikachary, 1959: 224.
Phormidium simplicissimum (Gomont) Anagnostidis & Komárek, 1988: 406.
INDIAN OCEAN DISTRIBUTION: India.
Note: Drouet (1968: 281, 294) chose a specimen in PC as the lectotype of this species and assigned it to Microcoleus lyngbyaceus (Kützing) P. Crouan & H. Crouan.