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Leaves (Morphology and Anatomy of Other Leaf Types (succulent leaves…
Leaves
Morphology and Anatomy of Other Leaf Types
succulent leaves
thick and fleshy
adaptation
water conservational
sclerophyllous foliage leaves
soft, flexible, edible
highly resistant to
animals
fungi
freezing
UV light
leaves of conifers
leaves of sclerophylles
thick cuticle
thick walls
needles
bud scales
evolutionary leaf conversion
protect from
low temperature
drying by wind (winter)
petiole
#
short/absent
tougher
waxier
spines
cacti
two leaf types
microscopic green leaves
green cactus body
axillary buds
cluster of spines
modified leaves
protection against herbivores
no
mesophyll
parenchyma
vascular tissue
mesophyll
#
closely packed fibers
Tendrils
modified leaf
surround solid objects
leaves with Kranz Anatomy
C4 photosynthesis
CO2 transport requires
Kranz Anatomy
clustered ring
lack
palisade parenchyma
spongy mesophyll
insect traps
trap/digest insects
secretes watery fluid
digestion
numerous
stomata
vascular bundles
#
mesophyll
#
External Structure of Foliage Leaves
leaf blade lamina
light-harvesting
dorsal surface
abaxial side
lower side
ventral surface
adaxial
smooth
upper side
petiole
stalk
blade of light
prevents self-shading
long, thin, flexible
cool leaf
no petiole
sessile leaf
sheathing leaf base
leaf base wrap
simple leaf
one-part blade
compound leaf
several part blades
leaflets
small blades
attached by petiole
rachis
extension of petiole
veins
vascular tissue bundles
water stem to leafe
collect sugars
reticulate venation
netted
petiole
#
abscision
leaf base
cut dead leaf
leaf scar
protective scar tissue
Internal Structure of Foliage Leaf
epidermis
transpiration
Mesophyll
G.T.I. to leaf epidermis
palisade parenchyma
upper surface cells
main phtosynthetic tissue
spongy mesophyll
open, loose parenchyma
carbon diffusion (stomata)
vascular tissue
#
mid rib (midvein)
eudicot leaf
leteral veins emerge
branch to minor vein
narrow
release water
bundle sheath
protection from insects
bundle sheath extension
rigidity
water movement
petiole
leaf traces
multiple vascular bundles
stipules
small tissue flaps
protection apical meristem
Initiation and Development of Leaves
basal angiosperms and eudicots
leaf primordium
interior to protoderm
protrusion
extends into cone
monocots
hood-like shape
cylinder
sheathing leaf base
cuter
abaxial epidermis
strap-shaped leaves
