Ulva rigida C. Agardh
Common names: Sea Lettuce.
Glasán (Irish).
Description: Thallus sheet-like, emerald green,
stiff at the base and more delicate near the growing edges, to
300 long, sometimes with irregular elliptical holes (above).
Persists throughout the year.
Habitat: on rock and growing as an epipthyte,
often developing "green tides"
Distribution: Common and widely distributed.
Key characteristics: emerald green colour and
stiffness of thallus; however, this and other species of
Ulva in the NE Atlantic require expert identification,
and even then there is much dispute as to the status of the
various species that have been reported including
U. fenestrata, U.
gigantea, U. scandinavica, and U. armoricana.
Photographs © M.D. Guiry
- BioAtlantis provides sustainable technologies from the sea to enhance plant, animal and human health.
- Connemara Organic Seaweed Company provide hand harvested, sustainable, kelp and seaweed products for human consumption through health supplements and edible products.
- Emerald Isle Organic Irish Seaweed. A family business producing seaweed as supplements, cooking, gardening and bath products.
- Irish Seaweeds Ltd are suppliers of 100% natural hand-harvested seaweeds and edible sea vegetable products from Ireland.