FRST 200 Lecture Notes - Lecture 18: Thuja Plicata, Primordium, Stoma
Document Summary
Leaf primordium elongates and a cambial strand = procambium develops into it, forming mid vein. Meristems on either side make the blade. More cell division, elongation & maturation produces a mature leaf with cells for protection, support, transport and photosynthesis. Epidermis on the lower abaxial and upper adaxial surface. Has stomata consisting of stomata pores and a pair of guard cells; for gas exchange; can be on both surfaces, but usually more below. Guard cells only epidermal cell with chloroplasts in them. May have trichomes hair glands things that stick out. Mesophyll main tissue, ground meristem middle leaf. Stomata often in pits or crypts covered by wax. Many have palisade and spongy parenchyma, but not the pines. 1 or 2 vascular bundles, surrounded by transfusion tissue and an endodermis. Usually have resin ducts lined with parenchyma cells. Ti - transport of materials between vascular bundles and mesophyll. Morphology may vary with environment: e. g. water or light, e. g.
