part_of part of part of portion of plant tissue inner integument endothelium A portion of plant tissue (PO:0009007) which is composed of cells of the inner epidermis of the inner (or only) integument of the ovule that are radially elongated and metabolically very active. PO:0020024 endotelio (Spanish, exact) plant_anatomy portion of endothelium (exact) 内皮（？） endothecium? (Japanese, exact)