This document contains images and descriptions of stem cross sections from different plant species including Tilia, corn, Cucurbita, magnolia, and Helianthus. The images show differences in vascular bundle arrangement and patterns of thickening in the cell walls between monocots and dicots as well as differences between young and old dicot stems.

2. PHLOEM
XYLEM
DICOT TILIA STEM OLDER x.s. 3yrs old

3. XYLEM
PHLOEM
DICOT TILIA OLD STEM

4. XYLEM
PHLOEM
DICOT TILIA YOUNG STEM

5. HELICAL
THICKENING
MONOCOT CORN STEM L.S.

6. C
B D
A
A,B,D - HELICAL THICKENING
C - ANNULAR THICKENING
DICOT CUCURBITA MACERATED
STEM

7. HELICAL
THICKENING
DICOT CUCURBITA

8. SCALARIFORM
PITTING
MAGNOLIA MACERATED STEM

9. HELICAL THICKENING
DICOT TILIA MACERATED STEM

10. ANNULAR
THICKENING
CORN MACERATED STEM L.S

11. SCALARIFORM
PITTING
HELIANTHUS MACERATED
STEM

12. BIOLOGY 175.1
PLANT MORPHOLOGY
UNDER:
MR. MUHMIN MICHAEL
MANTING