RELATIONSHIPS BETWEEN SOME NORTH-ATLANTIC AND NORTH PACIFIC SPECIES OF PORPHYRA (BANGIALES, RHODOPHYTA) - EVIDENCE FROM ISOZYMES, MORPHOLOGY, AND CHROMOSOMES

Five pairs of putative sibling species of Porphyra are recognized between the boreal Nor-th Atlantic and North Pacific oceans on the basis of similarities in isozymes, morphology, and chromosomes. These pairs are North Atlantic P. amplissima and North Pacific P. miniata (recognized here as P. cuneiformis), North Atlantic P. " leucosticta " and North Pacific P. fucicola, North Atlantic P. "linearis" and North Pacific P. pseudolinearis, North Atlantic P. miniata and North Pacific P. variegata, and North Atlantic P. "purpurea" and North Pacific P. "purpurea." Species names in quotation marks are tentative, pending verification by further studies, since at least two species are currently recognized by each of these names. Evidence from isozymes and morphology is used to support separation of P. amplissima and P. cuneiformis from P. miniata, and reference is made to their type specimens.