Porphyra umbilicalis Kützing

Common names: Sleabhach, Sleabhcán, Sliucáin, Sleadaí (Irish); Laver, Tough Laver, Slack (English), Nori (generic English name derived from Japanese)

Callophyllis laciniata
Description: Membranous, one layer in thickness, olive to brown-purple fronds, to 130 mm long and 100 mm wide, irregularaly lobed and split from central holdfast. Appreaing almost orbicular; often much pleated, and multiple baldes grouped together to appear like a rosette. SImilar to thick plastic sheeting to touch.

Poprhyra umbilicalis
Habitat: Generally on mussels, sometimes on rock; mid-intertidal to splash zone, generally distributed, abundant, especially on exposed coasts in spring and summer.
Key characteristics:
centrally attached fronds, lettuce-like appearance. May be a species-complex.

Usage: At Kilkee, Co. Clare, Ireland, it is gathered in Spring for boiling with bacon where it is known as known as Slack, Sleabhac, or Sliucáin (John WIlliams, Kilkee, pers. comm.).

Species list