High Quality Content by WIKIPEDIA articles! Fucus is a genus of
brown alga in the Class Phaeophyceae to be found in the intertidal
zones of rocky seashores almost everywhere in the world. The
thallus is perennial with an irregular or disc- shaped holdfast or
with haptera. The erect portion of the thallus is dichotomous or
subpinnately branched, flattened and with a distinct midrib. Gas-
filled pneumatocysts (air-vesicles) are present in pairs in some
species, one on either side of the midrib. The erect portion of the
thallus bears cryptostomata and caecostomata (sterile surface
cavities). The base of the thallus is stipe-like due to abrasion of
the tissue lateral to the midrib and it is attached to the rock by
a holdfast. The gametangia develop in conceptacles embedded in
receptacles in the apices of the final branches. They may be
monoecious or dioecious.
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