Biodiversity & Conservation

Ulva spp. on freshwater-influenced or unstable upper eulittoral rock



Image David George - Fallen chalk blocks covered in Enteromorpha. Image width ca 4 m.
Image copyright information

Distribution map

LR.FLR.Eph.Ent recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)

  • EC_Habitats

Marine natural heritage importance

Listed under EC Habitats Directive
National importance Uncommon
Habitat Directive feature (Annex 1) Reefs
Large shallow inlets and bays

Biotope importance

No text entered.


Porphyra may be locally collected for use as an ingredient in 'Laver bread'.

Additional information icon Additional information

This biotope is considered to be nationally uncommon (Connor et al., 1997b) but is probably under recorded.

This review can be cited as follows:

Budd, G.C. 2004. Ulva spp. on freshwater-influenced or unstable upper eulittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 26/11/2015]. Available from: <>