Key to the species of Galaxaura

1	Plants flattened throughout, lateral margins raised and sometimes inrolled; apices pointed	*G. marginata* (Ellis & Solander) Lamouroux
1	Plants terete throughout or only through lower half	2
2	Assimilatory filaments protruding through calcified layer randomly or in whorls; apices rounded; straw, rose, or orange colored	*G. rugosa* (Ellis & Solander) Lamouroux
2	Assimilatory filaments long and conspicuously in clusters alternating with short filaments; dark wine red	*G. fasciculata* Kjellman