Abstract
The marine red alga Dudresnaya okiensis sp. nov. (Dumontiaceae, Rhodophyta) is described from the Sea of Japan. It is a deep-water species with the following characters: terete, radially branched thallus, with annulations in young branches, hexagonal crystals in axial cells, hairs, distinct primary axes, cylindrical outer cortical cells, rhizoids up to 36 μm in diameter and bearing cortical laterals, carpogonia once or twice obliquely divided, and an isomorphic alternation of generations; lacking indeterminate-axis primordia, a mucilage coat around the carpogonial and auxiliary-cell filaments, and distinctly cleft cystocarps; and with gonimoblast initials that may or may not be recurved around their auxiliary-cell filament.
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