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Ulva intestinalis

Observed: 3rd March 2012 By: gramandy
Kent Wildlife TrustThanet Coast ProjectWildwood Trust
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ulva intestinalis

abundant at top of littoral zone covering chalk stone

Species interactions

No interactions present.


JoC's picture


The British seaweeds that that were in genus Enteromorpha are now considered to be in the genus Ulva. Finding the currently accepted name is now made easy with the World Marine Register.

This could be Ulva intestinalis, as that species is generally considered to be the commonest. However, identification of the "gut weeds" to species level in the field is difficult. The degree and pattern of branching is now considered to be environmentally, not genetically, determined. Microscopic characters which are useful are the arrangement of the cells, the chloroplast shape and the number of pyrenoids in the cells.

I do not know of an on-line key for these.
The definitive book is Green Seaweeds of Britain and Ireland, 2008. Edited by Juliet Brodie, Christine A Maggs and David M John. British Phycological Society. This has keys, colour photos, b&w photos, drawings.