The New Student's Reference Work/Columella
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Columel′la (in plants), an axis of sterile tissue which passes through the center of the spore-case of mosses. See Musci.
See also Columella (botany) on Wikipedia, and the disclaimer.
Columel′la (in plants), an axis of sterile tissue which passes through the center of the spore-case of mosses. See Musci.