Abstract
The marine red alga Dudresnaya kuroshioensis sp. nov. (Dumontiaceae, Rhodophyta) is described from southernmost Honshu, Japan. It is a deep-water species with the following characters: terete, radially branched and not villose thalli, hexagonal crystals in axial cells, hairs, distinct primary axes, cylindrical outer cortical cells, rhizoids up to 21 μm in diameter, carpogonia once obliquely or transversely divided, a distinctly cleft cystocarp and an isomorphic alternation of generations. It lacks annulations in young branches, indeterminate-axis primordia, rhizoids with cortical laterals, a mucilage coat around the carpogonial and auxiliary-cell filaments; gonimoblast initials mayor may not be recurved around their auxiliary-cell filaments.Dudresnaya kuroshioensis is compared to Japanese, Austral-Pacific and North American species that most resemble it anatomically but differ in at least one significant character. It is concluded that the Australian D. capricornica is probably the closest relative of the new species, differing mainly in overall size, rhizoid diameter and the anatomy of the mature cystocarp.
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