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Set 1, Slide 82, Cross Section, Lightfield
Pine Linked Set

Pine

 

Leaf Linked Set

Leaf

 

Pine Leaf CS - Collage 40xA cross-section of a pine leaf sample is composed of many cells. Transparent cells are in pith, xylem, and endodermis. Green cells compose mesophyll tissues. Cross-sections of stomata are only found in the edges, or epidermis. Resin canals are found on the surface of the mesophyll tissues. The resin canals function as water pipes for leaf.

Resin Canal

Image Data Description
Pine Leaf CS - Resin Canal 400x
400x
Resin canal is surrounded by resin secreting cells. These cells appear as to be dark green. The cells are unusually shaped like flower, maple tree leaf, clover, or pop-corn.  The center of the canal seems to be empty.

Xylem

Image Data Description
Pine Leaf CS - Xylem 400x
400x
Cells in xylem are much smaller compared to other cells in endodermis. The sizes and shapes of the cells are not constant, and some cells are filled with transparently greenish mucus.

Endodermis

Image Data Description
Pine Leaf CS - Endodermis
200x
Endodermis is like a border between the inner and outer parts of a leaf. By contrast to xylem cells, endodermis cells don't seem to be packed tightly. Rather, they are more circular and bigger.

Stomata

Stomata look like openings on epidermis. The stomata extends through the mesophyll tissues. Hypodermis cells seem to act like a gate; they are either open or closed.

Image Data Description
Pine Leaf CS - Stomata 400x
400x
The hypodermis cells are open. It looks like stomata takes in carbon dioxide.
Pine Leaf CS - Stomata 400x
400x
The cells are closed so that they seem to stop taking in carbon dioxide.

Mesophyll Tissues

Image Data Description
Pine Leaf CS - Mesophyll Tissues400x
400x
Mesophyll tissues form interesting shapes as described above.  Some chloroplasts seem to appear as lighter dots inside the tissue.

Epidermis and Hypodermis

Image Data Description
Pine Leaf CS - Epidermis and Hypodermis 400x
400x
Epidermis cells are uniform in shape. By contrast, hypodermis cells are various in shape and size. The hypodermis cells contain black dot inside. The epidermis cells seem to have red cell wall.
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