Studies of molecular taxonomy and distribution of bladed Bangiales (Rhodophyta) are still remaining actual due to their cryptic species diversity, insufficient information about species composition, reproductive biology and distribution in particular areas. Sequencing and phylogenetic analysis of Porphyra/Pyropia spp. collected off the coast of Brittany (France) was carried out during this study. Attempt of the cultivation of different species was also made. Phylogenetic analysis of rbcL and COX1 genes generally supported 3 groups of Porphyra species. Previously remarked difficulties with separation of the species with different morphology and ecotypes, P. linearis and P. umbilicalis, especially at the level of mitochondrial genes, were confirmed. Scallop shells, collected in the field near gametophytes of P. linearis, gave rise to Conchocelis. Different ecological niches for different species have been described, as well as successions and seasonal patterns in their development. Molecular taxonomy generally allowed clearly separate the species of Porphyra/Pyropia spp.
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