Sargassum angustifolium C. Agardh forma filiforme V. Krishnamurthy & H. Joshi, 1970: 13 (`filiformis').
INDIAN OCEAN DISTRIBUTION: India.
Note: V. Krishnamurthy & H. Joshi cited Srinivasan (1967) as the source of this record, but that author recognized no forms of Sargassum angustifolium. The varietal epithet is derived from Fucus filiformis Klein, a manuscript name first cited by Kützing (1849: 612). V. Krishnamurthy & H. Joshi attributed the trinomial to Klein, but that attribution seems to be erroneous.