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Structure of Woody Plants ( plant-growth-9-728 Secondary Xylem: The Wood…
Structure of Woody Plants
Vascular Cambium :!:
Production for the secondary plant body.
Arrangement of Cambial Cells:
Rays are grouped in short
vertical
rows [(one cell wide (uniseri-ate)].
Fusiform (like the fuselage of an aircraft) are in
horizontal
rows or irregularly (storied cambium).
Initiation of the Vascular Cambium - Intitials: 2 types of cells.
Fusiform Intials - Long and Tapered, Lengthwise/Longitudinal. Producers of many cell types
Ray Initials - Short and less cuboidal. Mainly for Storage
Outer Bark
Cork & The Cork Cambium: The outtermost layers of wood - serves as protectant from fungus and bacteria and worms and wood boring birds/insects/other mammals.
Initiation of Cork Cambia
Lenticals & Oxygen Diffusion: Keep out pathogens. Aligned with the forward direction of the wood growth.
Secondary Growth in Roots: The cork and vascular cambium which produce most of the girth in a plant/tree.
Secondary Xylem: The Wood
Growth Rings: Formed for Annual Springs, or continuously forming if it's eternally Spring climate.
Sapwood (outter region)
Heartwood (Inner Core)
Reaction Wood: Branches that are stressed laterally from gravity. Growth rings are wider in these limbs.
Anamalous Forms of Growth
Unusual Primary Growth: Having a singular vascular cambiem.
Anomalous Secondary Growth: Alternative cambia producing secondary bodies
Secondary Phloem: what used to be primary phoem. Responsible for conduction in the axial system .