| Name | Notes |
|---|---|
| sea flax weed | Stypocaulon scoparium (sphacelariaceae) |
| Key criteria: | A fairly distinctive tufted plant quite common in lower intertidal pools and in the shallow subtidal in the south-west rarer further north and on the east coast. lower intertidal intertidal shallow subtidal subtidal pool |
| hairy sand weed | Cladostephus spongiosus (sphacelariaceae) |
| Key criteria: | A common and distinctive species with characteristic closely packed whorls of branchlets found in lower intertidal pools and emergent and in the shallow subtidal of all coasts. lower intertidal intertidal shallow subtidal subtidal pool |
A Check-list and Atlas of the Seaweeds of Britain and Ireland. F. G. Hardy and M. D. Guiry. The British Phycological Society, 2003. ISBN 0 9527115 16 Seaweeds of Britain and Ireland. Bunker, Brodie, Maggs and Bunker. Seasearch 2012.