| Name | Notes |
|---|---|
| green sponge ball | Codium bursa (codiaceae) |
| Key criteria: | Forming large (to 20 cm) balls in the subtidal in sheltered habitats; unmistakable when found. Extremely rare in the area as indicated here. subtidal sheltered |
| Atlantic green sponge fingers | Codium fragile subsp. atlanticum (codiaceae) |
| Key criteria: | Large (to 50 cm) branched spongy fingers introduced from the Pacific Ocean and now common intertidally and in the very shallow subtidal on rock. Can be difficult to distinguish from other branched Codium species. Widespread and fairly common in the area as indicated here. intertidal shallow subtidal subtidal rock |
| green sponge fingers | Codium fragile subsp. tomentosoides (codiaceae) |
| Key criteria: | Large (to 50 cm) branched spongy fingers introduced from the Pacific Ocean and now common intertidally and in the very shallow subtidal on rock. Can be difficult to distinguish from other branched Codium species. Widespread and fairly common in the area as indicated here. intertidal shallow subtidal subtidal rock |
| no common name | Codium tomentosum (codiaceae) |
| Key criteria: | Large (to 20 cm) branched spongy fingers growing on bedrock particularly in pools intertidally and in the very shallow subtidal. Largely confined to southern and western shores in the area as indicated here. intertidal shallow subtidal subtidal rock pool |
| no common name | Codium vermilara (codiaceae) |
| Key criteria: | Large (to 45 cm) branched spongy fingers growing on bedrock mostly in the subtidal. Confined to south- western shores in the area as indicated here; possibly under-recorded. subtidal rock |
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.