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A seasonal study of field-collected individuals of  Porphyra leucosticta  at Sidmouth, Devon, UK showed that the blade phase was present from April to September 2001. Specimens of  P. leucosticta  were epiphytic on  Fucus serratus, Mastocarpus stellatus, Chondrus crispus  and  Osmundea pinnatifida , and epizoic on  Mytilus edulis , often found growing in layers on the host. Field material was monoecious, with male and female gametangia in separate sori, but intermixed along the margins of thalli. Mean size (wet mass and dry mass, length and width) was lowest in April and greatest in July. All spores released in culture from field-collected material developed into conchocelis, except one individual, which released archeospores that developed into blades. The life history was completed in culture at both 15°C/long days (16:8 h light:dark cycle) and 15°C/short days (8:16 h light:dark cycle). A protothallus developed directly on the vegetative conchocelis filament by divisions of one of the vegetative cells and either detached and dropped to the bottom of the culture dish or remained as part of the conchocelis. The protothallus produced either archeosporangia or male and female gametangia or both. Chromosome numbers of n=3 in male gametangia, 2n=6 in zygotosporangia and 2n=6 in the conchocelis phase suggest that fertilisation had taken place.

Phenology and the life history in culture of Porphyra leucosticta (Bangiales, Rhodophyta) from Britain