endocarp

adjective, noun

(Gr. endo: inside; karpos: fruit) The innermost layer of the pericarp. The inter layer of the wall of a matured ovary; when its texture differs from the outer wall, it may be hard and stony, membranous, or fleshy. In a drupe, the stony layer surrounding the seed. Of a lichen having the apothecia embedded in the thallus.