Page 59 – Stomata
Fig. 52 . Stomata. Views of the abaxial surface of the longest leaf from a 3-months-oId seedling to show stomata and their component parts as they appear at different levels. A: a. View of entire stomatal apparatus with the subepidermal layer indicated with broken lines; b, c and d, individual structural parts seen with successively deeper focus. B: a. Guard cells which project above the level of the epidermal cells (shown with broken lines); b, at level of epidermal cells (12.5/ᵘ below the level of a,); c, at the level of the epidermal cells (12.5/ᵘ below the level of b); d, at the level of the subepidermal cells (12.5/ᵘ below the level of c; ep,epidermal cell; gc, guard cell; lac, lateral accessory cell; pac, polar accessory cell; sa, stomatal apperture; sep, subepidermal cell (hypodermal cell in an older leaf); ssc, substomatal chamber; ssr, sub-stoaatal chlorophyllaceous ring cell. X340.