Key to the common species of Gelidium

1 Plants up to 20 cm high, axes like a plume at top, smooth or slightly toothlike below; occurring in areas of strong water motion G. pluma Loomis
1 Plants with axes and branches cylindrical to compressed, mostly irregularly pinnately branched; no more than 4 cm high, commonly forming mats on seaward facing rocks G. pusillum (Stackhouse)Le Jolis

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