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Chapter 6: Leaves (Morphology & Anatomy (Succulent Leaves,…
Chapter 6: Leaves
Morphology & Anatomy
Succulent Leaves
Sclerophyllous Foliage Leaves
Leaves of Conifers
Bud Scales - most common modifications
Spines
Tendrils - another form of modified leaf
Leaves with Kranz Anatomy
Insect Traps - trap & digest insects
External Structure of Foliage Leaves
• Not lose excessive amounts of water
• Not allow entry of fungi/bacteria/epifoliar algae
• Not be too nutritious
Leaf blade (lamina) - light harvesting
Dorsal Surface - Lower side
Ventral Surface - Upper side (smooth)
• Petiole (stalk) - holds blade into light
—> small/long/narrow, self-shading - Sessile Leaf
SIMPLE leaf
one part blade
COMPOUND leaf
divided blade
Veins (bundles of vascular tissue) - distribute water from stem into leaf
Internal Structure of Foliage Leaves
EPIDERMIS
MESOPHYLL - ground tissue interior to leaf epidermis
Spongy Mesophyll - Lower portion of leaf
VASCULAR TISSUE - between palisade parenchyma & spongy mesophyll
PETIOLE - between stem & lamina
Initiation & Development
Basal Angiosperms & Eudicots
Monocots
