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Woody Plant Structure (Secondary Xylem (Wood) (Types of cells (Ray…
Woody Plant Structure
Secondary Xylem (Wood)
Types of cells
All types of cells from Primary Xylem
Axial system
tracheary
Radial system
hard or softwoods
Ray parenchyma
upright
procumbent
ray tracheids
Growth Rings
Late wood
annual/growth ring
diffuse porous
ring porous
Heart/Sapwood
lighter vs darker
tylosis
Rxn Wood
Stress related
Secondary Phloem
Axial System
up and down
Radial system
Vascular Cambium
Ray Initials
cuboidal
short
Fusiform Initials
long, tapered
periclinal wall
parallel to circumference of cambium
anticlinal walls
longitudinal divide to increase cells
Cambial Arrangement
Storied cambium
regular horizontal rows
nonstoried cambium
no horizontal pattern
Fascicular
"Bundle"
Interfascicular
Connects w/fasciculalr
Outer Bark
Cork/Cork Cambium
Phellogen
Cork (phellem) cell
phelloderm
periderm
outer/inner bark
Lenticels
lets oxygen penetrate bark
Oxygen Diffusion
Initiation of Cork Cambia
green to tan
Secondary Growth in Roots
Vascular cambium
#
Ray and fusiform initials
Sap and Heartwood
Porous
Anomalous Forms
Secondary Growth
sweet potato roots
included phloem
#
unequal actiivty
Monocots
secondary vascular bundles
fibrous, woody tissue
Unusual Primary Growth
#
Establishment growth
palm trees
