Glossary
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U
- uniaxial - having axis composed of one single filament
- unilocular - produced in a single cavity or cell as in the unilocular sporangium of the brown algal order Ectocarpales
- utricle - swollen terminal portion of filament or siphon as in siphonous green alga Codium
V
- valve - opposite faces of diatom frustule or cell wall
- vesicle - membrane-bound organelle
W
- wrack - tangled mass of seaweeds on the beach
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