Leathesia
Leathesia (family Corynophlaeaceae, order Ectocarpales) A genus of brown seaweeds which form small (2.5–5 cm) bulbous growths on rocks or on other seaweeds; at first the bulbs are solid, but later they become hollow. The surface is shiny in living plants. Leathesia is common around British coasts, being found on the middle and lower shore from spring to early autumn.
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Leathesia