Porphyra umbilicalis Kützing
Description: Membranous, one layer in thickness, olive to brown-purple fronds, to 200 mm long, irregularaly lobed and split from central holdfast.
Habitat: Generally on mussels, sometimes on rock; midtidal to splash zone, generally distributed, abundant, especially on exposed coasts in spring and summer.
Key characteristics: centrally attached fronds, lettuce-like appearance.
Species list
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