COCCIDIUM, a rounded conceptacle in _Algæ_ without pores, and containing a tuft of spores. COCHLEAR, a kind of æstivation, in which a helmet-shaped part covers all the others in the bud. COCHLEARIFORM, shaped like a spoon. COCHLEATE, shaped like a snail shell. COLEORHIZA, a sheath, surrounding the radicles of a monocotyledonous embryo. COLLATERAL, placed side by side, as in the case of some ovules. COLLUM, neck, the part where the plumule and radicle of the embryo unite. COLUMELLA, central column in the sporangia of mosses. COLUMN, a part of a flower of an orchid supporting the anthers and stigma, and formed by the union of the styles and filaments. COMA, a tuft of hair on a seed. COMMISSURE, union of the faces of the two achænes in the fruit of _Umbelliferæ_. COMOSE, furnished with hairs, as the seeds of the willow. COMPOUND, composed of several parts, as a leaf formed by several leaflets. COMPRESSED, flattened laterally or lengthwise. CONCENTRIC, curves with common centre. CONCEPTACLE, a hollow sac containing a tuft or cluster of spores. CONCRETE, hardened into a mass. CONDUCTING TISSUE, applied to the loose cellular tissue in the interior of the style. CONDUPLICATE, followed upon itself, applied to leaves and cotyledons. CONE, a dry multiple fruit, formed by bracts covering naked seeds. CONFERRUMINATE, indistinguishably united together. CONFERVOID, formed of a single row of cells, or having articulations like a _Conferva_. CONFLUENT, when parts unite together in the progress of growth. CONJUGATION, union of two cells, so as to develop a spore. CONNATE, when parts are united, even in the early state of development; applied to two leaves united by their bases. CONNECTIVE, the part which connects the anther-lobes. CONNIVENT, when two organs, as petals, arch over so as to meet above. CONSTRICTED, contracted in some particular place. CONTORTED, when the parts in a bud are imbricated and regularly twisted in one direction. CONVOLUTE, when a leaf in the bud is rolled upon itself. CORDATE, of leaves heart-shaped at the base. CORDIFORM, having the shape of a heart. CORIACEOUS, having a leathery consistence. CORM, thickened underground stem, as in _Arum_ and _Colchicum_. CORNUTE, horned. COROLLA, the inner envelope of the flower. COROLLIFLORÆ, gamopetalous exogens. CORONA, a coralline appendage, as the crown of the daffodil. CORPUSCLE, a small body or particle. CORRUGATED, wrinkled or shriveled. CORTEX, the bark. CORTICAL, belonging to the bark. CORYMB, a raceme, in which the lower stalks are the longest, and all the flowers come very nearly to a level above. COSTATE, provided with ribs; primary. COTYLEDON, the temporary leaf of the embryo. CREMOCARP, the fruit of _Umbelliferæ_, composed of two separable achænes or mericarps. CRENATE, having superficial, rounded, marginal notches.