Lower epidermis. Typically. most of the stomata (thousands per square centimeter) are located in the lower epidermis.
Scattered throughout the epidermis (primarily the lower epidermis) are pairs of specialized cells with chloroplasts called guard cells . A pore, the stoma, lies between these cells, and allows gases to pass into and out of the leaf.
Dicotyledons usually have more stomata on the lower epidermis than the upper epidermis. As these leaves are held horizontally, upper epidermis is directly illuminated. Less number of stomata on the upper epidermis can then prevent water loss.
plant leaf tissue located between the upper and the lower epidermis
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
mesophyll /MEZ-oh-fill/ The mid-layer of a leaf between the upper and lower epidermises; portion of a leaf where photosynthesis occurs.
(mez-oh-fil) [Gk. mesos, middle + phyllon, leaf]
The ground tissue of a leaf, sandwiched between the upper and lower epidermis and specialized for photosynthesis.
messenger RNA (mRNA) ...
The epidermis is usually transparent (epidermal cells lack chloroplasts) and coated on the outer side with a waxy cuticle that prevents water loss. The cuticle is in some cases thinner on the lower epidermis than on the upper epidermis, ...
This tissue is found in the lower half of the leaf (lower surface) and has few chloroplasts. It provides gas exchange (CO2 uptake and O2release) and therefore needs to be close to the stomata found in the lower epidermis.
See also: Plant, Epidermis, Leaf, Cells, Tissue