1. Lab #8 Angiosperms

2. Plastids
Amyloplasts – from garden bean
chromoplasts – from red pepper

3. Epidermal structures Trichome and leaf cross section
Guards cells + Stoma

4. Mesophyll – Palisade and Spongy
epidermis

5. Monocot Root xylem (vessel element & tracheids) pith phloem pericycle

6. Monocot root endodermis xylem (vessel element & tracheids) pith phloem
pericycle
endodermis
pith

7. Monocot stems
epidermis
parenchyma

8. Monocot Stem Vascular Bundle
xylem
sclerenchyma is called a bundle sheath in
monocot leaf vascular bundles

9. Monocot Leaf

10. Dicot Root vascular cylinder = stele pericycle phloem metaxylem
endodermis
metaxylem
from Biology 311 site Alison Roberts © AWR

11. Dicot Lateral Root

12. Dicot stems Trifolium (clover) epidermis cortex pith
Helianthus (sunflower)
phloem
vascular
cambium
metaxylem
protoxylem
from Biology 311 site Alison Roberts © AWR

13. Dicot Stem sclerenchyma fasicular xylem interfasicular cambium pith
phloem
Dicot Stem

14. Dicot Stem Vascular Bundle
sclerenchyma
tracheids
region of
protoxylem
metaxylem

15. Dicot Leaf
Stained cross-section through the leaf of lilac: 1 upper epidermis, 2 palisade parenchyma, 3 spongy parenchyma, 4 air cavity, 5 lower epidermis, 6 stomata, 7 trichome, 8 major vein, 9 xylem, 10 phloem, 11 supporting tissue (sclerenchyma)

16. Dicot Leaf

17. Dicot vs. Monocot Vascular Bundles
Sclerenchyma
tracheid
Sclerenchyma
DICOT
MONOCOT
from Biology 311 site Alison Roberts © AWR

18. Dicot vs. Monocot Root

19. Monocot vs. Dicot Stem
DICOT
MONOCOT

20. No vascular cambium – no secondary growth!
sclerenchyma
phloem
metaphloem
protoxylem
metaxylem

21. WATER-CONDUCTING CELLS OF THE XYLEM
Tracheids
with circular-bordered pits
in their primary walls
TRACHEIDS
Tracheids
Pits
WATER-CONDUCTING CELLS OF THE XYLEM
from Biology 311 site Alison Roberts © AWR

22. VESSEL ELEMENTS perforation plates in the
side walls of a vessel element
vessel elements
with perforation plates
tracheids

23. Ash wood perforation plate xylem ray vessel element tracheids
perforation plate: the end wall of a vessel element where the secondary cell wall was not deposited and the primary cell wall has been digested.
vessel
element
tracheids
from Biology 311 site Alison Roberts © AWR

24. vessel elements tracheids
from Biology 311 site Alison Roberts © AWR

25. perforation plates pits
from Biology 311 site Alison Roberts © AWR

26. Tracheids with annular thickenings
from Biology 311 site Alison Roberts © AWR

27. 3 yr Tilia stem (Basswood)
secondary
xylem
(tracheids &
vessel elements)
vascular
cambium
phloem
cork
cork + cork cambium = periderm
vascular cambium to cork = Bark

28. Cork Cambium lenticel cork cork cambium
from Biology 311 site Alison Roberts © AWR

29. Lenticel
from Biology 311 site Alison Roberts © AWR