Key to the common 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

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