Taxonomic and morphological studies of tropical and subtropical species of Callophycus (Solieriaceae, Rhodophyta)

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Abstract
Three species of Callophycus are described. C. serratus (Harvey ex Kuetzing) Silva is widespread along the western and southern rims of the Pacific Ocean from the Philippines to Tonga, while C. densus (Sonder) Kraft comb. nov. [basonym: Thysanocladia densa] and C. tridentifer Kraft sp. nov. are limited to the Australian east coast. Although C. serratus apparently represents a relatively primitive level of evolution, with small, aggregated cystocarps and comparatively simple carposporophytes, the 2 eastern Australian species apparently are more advanced and represent the ends of 2 divergent lines of development within the genus. The 3 Pacific taxa are compared to the 5 temperate Australian species of Callophycus [C. laxus, C. oppositifolius, C. harveyanus, C. costatus, C. dorsiferus] and the habits of cystocarpic axes of all eight are illustrated and contrasted.

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