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calyptra a cap.  
capsule A simple, dry fruit, consisting of 2 or more carpels. Usually dehiscent, ie. it splits apart to release the fruit.  
costa Midrib or vein.  
costapalmate A fan-shaped palm leaf with a costa extending into the blade. [picture]  
crustose lichen Lichens that are closely appressed to the substratum and attached to it by the hypae of the medulla. [picture]  
cystoliths a crystal, or concentration of calcium carbonate in a cell.