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Halymenia a genus of a macroscopic red algae that grows in oceans worldwide.
Large ruffled seaweed is common on shores, attached to coral rubble.
Clumps of several sheets up to 10-20cm across, translucent flexible (not stiff) slippery and slimy. Surface may be plain or have large paler blotches or mottles. Colours red, maroon, brownish-orange.
Synonymised names:
Sebdenia dilatata (Zanardini) De Toni, 1900