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Abstract
Laurencia iridescens sp. nov. (Rhodophyta), a repent species, described from Guadeloupe (French West Indies) and Puerto Rico, is distinguished by the following set of characters: a perpendicular arrangement of its tetrasporangia, the presence of secondary pit connections between epidermal cells, the highly concrescent axes displaying a brilliant blue iridescence, and the absence of both ‘corps en cerise’ in the cortical cells and lenticular thickenings in the walls of the medullary cells.