plant organ - a functional and structural unit of a plant or fungusseptum - a partition or wall especially in an ovary archegonium - a female sex organ occurring in mosses, ferns, and most gymnosperms calyx tube, floral cup, hypanthium - the cuplike or ringlike or tubular structure of a flower which bears the sepals and stamens and calyx (as in Rosaceae) cup - cup-shaped plant organ hypobasidium - special cell constituting the base of the basidium in various fungi especially of the order Tremellales galea - an organ shaped like a helmet; usually a vaulted and enlarged petal as in Aconitum lamella, gill - any of the radiating leaflike spore-producing structures on the underside of the cap of a mushroom or similar fungus root - (botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground root cap - thimble-shaped mass of cells covering and protecting the growing tip of a root root hair - thin hairlike outgrowth of an epidermal cell just behind the tip; absorbs nutrients from the soil stolon, offset, runner - a horizontal branch from the base of plant that produces new plants from buds at its tips stalk, stem - a slender or elongated structure that supports a plant or fungus or a plant part or plant organ capitulum, head - a dense clusters of flowers or foliage; "a head of cauliflower"; "a head of lettuce" foliage, leaf, leafage - the main organ of photosynthesis and transpiration in higher plants sprout - any new growth of a plant such as a new branch or a bud |