Fucus vesiculosus
English: Bladder wrack; Bladderwrack; Black tang; Rockweed; Bladder fucus; Sea oak; Black tany; Cut weed; Dyers fucus; Red fucus; Rock wrack.
Botany: seaweed; Chromalveolata; Heterokontophyta; Phaeophyceae; Fucales; Fucaceae; Fucus.
Content: iodine.
Taxonomy
Fucus does not belong to the Archaeplastidae but is member of the Chromalveolata. It is placed here as it is very similar to the algae in behaviour.