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Structure of Woody Plants (Growth Rings IMG_1209 (Late Wood (Summer wood,…
Structure of Woody Plants
Vascular Cambium
Is a meristem that produces the secondary plant body
Interfascicular Cambium
The portion of the vascular cambium that develops from parenchyma cells located between vascular bundles
Fascicular Cambium
The portion of the vascular cambium that develops within the vascular bundle
Secondary Xylem
Types of Wood Cells
Radial System
Developed from ray intials
Ray Parenchyma
Stores carbohydrates and other nutrients during dormant periods
Upright Cells
These cells are tall and typically have extensive cross-field pitting
Procumbent Cells
These cells are long and have little or no cross-field pitting
Axial System
Derived from the fusiform intials
Axial Parenchyma
Temporary reservoir of water
Outer Bark
Phelloderm
Parenchyma cells produced to the inside by the cork cambium, only a layer or two formed, phelloderm isn't present in all species
Periderm
Consists of cork, cork cambium, and any enclosed tissues such as secondary phloem
Cork Cell
Prevents loss of water and the entry of pathogens
Growth Rings
Late Wood
Summer wood, have a low proportion of vessels
Early Wood
Spring wood, have a high proportion of wide vessels
Diffuse Porous
Has vessels located throughout it
Ex. Yellow birch, aspen, sugar maple, and American holly
Ring Porous
Species with vessels restricted to mainly early wood
Ex. Red oak, sassafras, and honey locust
