Griffithsia crassiuscula C. Agardh, 1824: 145 (`Griffitsia') (type locality: "Ad Novam Hollandiam'').—Bory de Saint-Vincent, 1834: 176.— Allender, 1981: 22.
Taxonomic synonyms:
Griffithsia flabelliformis Harvey, 1844c: 450 (type locality: Georgetown, Tasmania).—De Toni, 1903: 1278.— K. Srinivasan, 1973: 5, pl. V.
Griffithsia corallina C. Agardh var. tasmanica Kützing, 1849: 659 (`tasmannica') (type locality: Georgetown, Tasmania).
Griffithsia tasmanica (Kützing) Kützing, 1862: 7, pl. 19: figs. c–e.—Grunow, 1867: 62.— Reichardt, 1871: 23.— Hemsley, 1884: 281.— Askenasy, 1888: 36, pl. IX: figs. 2, 3.
INDIAN OCEAN DISTRIBUTION: Australia, India, St. Paul Island.
Note: The synonymy was proposed by Baldock (1976: 526), who noted that Griffithsia corallina var. tasmanica and G. flabelliformis are based on the same collection (Gunn 1294).