columella -- A small column of tissue which runs up through the center of a spore capsule. It is present in hornworts, mosses, and some rhyniophytes.
compound leaves -- n. Leaves with two or more leaflets attached to a single leaf stem.
dextral Pertaining to the right; in gastropods, shell is dextral if opening is to right of columella when held with spire up and facing observer.
The promotion of gravitropism in Arabidopsis roots upon actin disruption is coupled with the extended alkalinization of the columella cytoplasm and a persistent lateral auxin gradient. Plant J. 39(1):113-25.
The depressed part of the medial nasal process between the globular processes forms the lower part of the nasal septum or columella; while above this is seen a prominent angle, which becomes the future apex (Figs. 45, 46), ...
 See also: Organ, Trans, Tissue, Cell, Plant
  
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