Abstract
DNA has been prepared from the fronds, conchocelis and mitochondria of an undescribed species of Porphyra. Two extra-chromosomal DNA molecules were found in 12–15% of the Porphyra fronds, of this species, from two locations on the coastline of New Zealand. These plasmids, of size 2.7 kb (F1) and 3.6 kb (F2), were shown to be distinct linear molecules with homology to each other. Fronds having F1 and F2 were shown to pass these molecules to their progeny conchocelis where they were stably maintained. Both F1 and F2 were associated probably with mitochondria.
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