Key to the common species of Grateloupia

1 Plants bladelike 2
1 Plants not bladelike; with percurrent axes, irregularly pinnately branched, growing in sandy-rocky areas with fresh-water intrusion G. filicina(Lamouroux) C. Agardh
2 Blades about 1 cm in diam. through broad subdichotomies, narrowing or divided toward top; rusty red G. hawaiiana Dawson
2 Blades with naked axes about 1/2 total height, topped by subdichotomously divided segments, tapering to attenuate tips; bleached yellowish if mid-tidal, deep red if low intertidal G. phuquocensis Tanaka & Pham

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