Fig. 10.2-9. Transverse section of elephant’s ear leaf (Colocasia; a relative of Philodendron). These are papillose epidermis cells. The outer wall was softened and then turgor pressure pushed the wall outward into the shape of a papilla. This can occur to various degrees in different species, such that the outer wall merely bulges slightly, or to the extreme of bulging out so much that it is considered to be a trichome rather than a papilla (there is no fundamental difference between a unicellular trichome and a papillose epidermis cell). Four dark red nuclei are visible, all located against the inner wall.