Porphyra umbilicalis Kützing

Callophyllis laciniata
Description: Membranous, one layer in thickness, olive to brown-purple fronds, to 200 mm long, irregularaly lobed and split from central holdfast.

Poprhyra umbilicalis
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