appendage, outgrowth, process - a natural prolongation or projection from a part of an organism either animal or plant; "a bony process"

podetium - an organ or body resembling a stalk; especially the outgrowth of the thallus of certain lichens on which the ascocarp is borne

peristome - (botany) fringe of toothlike appendages surrounding the mouth of a moss capsule

haustorium - a rootlike attachment in parasitic plants that penetrates and obtains food from the host

apophysis - (botany) a natural swelling or enlargement: at the base of the stalk or seta in certain mosses or on the cone scale of certain conifers

callus - (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid

nodule, tubercle - small rounded wartlike protuberance on a plant

spur - tubular extension at the base of the corolla in some flowers

aculeus - a stiff sharp-pointed plant process

acumen - a tapering point

fuzz, tomentum, hair - filamentous hairlike growth on a plant; "peach fuzz"

burl - a large rounded outgrowth on the trunk or branch of a tree