Columella

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columella
1. In corals, a rod-like structure formed from the swollen axial end of the counter-septum that may occur as a central structure within the skeleton.

2. In gastropods (Gastropoda), a spiral, rod-like structure formed by the fusion of the inner shell surfaces of the whorls where coiling around the vertical axis is very tight.

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columella The central column of sterile tissue within a spore-bearing structure, found in some fungi and gymnosperms (e.g. Diselma).

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columella
1. In corals, a rod-like structure that is formed from the swollen end of a septum. It may form a central structure within the skeleton.

2. In Gastropoda, a spiral, rod-like structure that is formed by the fusion of their inner surfaces in shells that are coiled very tightly around an axis.

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columella (pl. columellae).
1. Baluster.

2. Colonnette.