Hutchinsia obscura C. Agardh, 1828: 108 (type locality: Cádiz, Spain).
Lophosiphonia obscura (C. Agardh) Falkenberg in Schmitz & Falkenberg, 1897: 460.
Taxonomic synonym:
Polysiphonia subadunca Kützing, 1843b: 418 (type locality: Corsica).
Lophosiphonia subadunca (Kützing) Falkenberg, 1901: 496.—Børgesen, 1939b: 132.— Newton, 1953: 397, 399, 415.— S. Dixit, 1970: 125.— McCain, 1984: 98.— Basson, 1992: 227.
INDIAN OCEAN DISTRIBUTION: Iran, Oman (Kuria Muria Islands), Saudi Arabia.
Note: The nomenclature of this species is discussed in the appended Taxonomic and Nomenclatural Notes.