Red Sea Lettuce (Halymenia)
Red sea lettuce is best picked floating when dislodged by waves.
Keep plants in a cool place as it turns orange and melts when exposed to fresh water or heat. Plants are best kept dried in a jar but should not be frozen.
University of Guam
Red sea lettuce is found in deep water either floating or under water and thrives in wave activity. The plant exists in various shapes and is dark magenta or purple in color. Red sea lettuce is poisonous in Samoa due to a toxic substance growing on the plant surface (Novaczek, 2001).