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Chapter 8 Structure of Woody Plants (Secondary Xylem (Types of Wood Cells,…
Chapter 8 Structure of Woody Plants
Vascular Cambium
Fusiform Initials
Periclinal division increases width
Anticlinal increases length
Ray Initials
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Mainly storage Parenchyma
Initiation of Vascular Cambium
Fascicular Cambium
Creates Secondary Xylem and Phloem
Interfascicular Cambium
Connects Fascicular Cambium
Arrangement of Cambial Cells
Non-Storied
Storied
Recent Evolution
Secondary Xylem
Growth Rings
delineate age
Can show environmental changes
Reaction Wood
Angiosperm only
Tension
wood
Gelatinous Fibers
Types of Wood Cells
Normally Secondary Xylem
Axial and Non-Axial Systems
Hard
Plenty of Fibers
Soft
Lack Fibers
Heartwood
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Tougher Dead
Sapwood
Still transporting water
Secondary Growth in Roots
Not only Stems
Contains both ray and fusiform initials
Outer Bark
Lenticels and Oxygen
Initiation of Cork and Cambia
Cortex sits underneath Phelloderm
Cork and Cork Cambium
Phelloderm
Phellogen
Phellum
Anomalous Forms of Growth
Anomalous Secondary Growth
Sweet potato roots
Included phloem
unequal vascular cambium activity
Unusual Primary Growth
Primary Tissues
Vascular Bundles
Pith
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Epidermis
Leaves
Secondary Tissues
Secondary Phloem
Bark
Secondary Xylem
Tough
Normally contains
Links with inner tissues
