Platysiphonia marginalis sp. nov. (Delesseriaceae), a new red alga from eastern Australia

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Abstract
A new species of the genus Platysiphonia Borgesen (Delesseriaceae, Rhodophyta), P. marginalis, is described from Lord Howe Island and is known also from the adjacent New South Wales (NSW) mainland at Coffs Harbour, the southern Great Barrier Reef, and possibly southern Japan. P. marginalis belongs to a small group of Platysiphonia spp. (including P. intermedia and P. parva) in which the flanking cells of the tetrasporangial axes are undivided. The new species differs from P. intermedia in its smaller size and regularly spaced, rather than often adjacent, anchoring rhizoids and from P. parva by the disposition of its rhizoids and the unmodified, rather than divided, flanking cells of its spermatangial axes.

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