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MINUTE STRUCTURE OF WOOD - Coggle Diagram
MINUTE STRUCTURE OF WOOD
PROSENCHYMA
function
conductive
mechanical
has bordered pits
PARENCHYMA
tissue
short
thin-walled cells
simple pits
function
storage
distribution
carbohydrate
VESSEL ELEMENT
cellular component of a vessel
VESSEL
hinged
tube like
indeterminate length
formed thru fusion of cells
longitudinal row
perforation of common walls
TRACHEIDS
fibrous
lignified cell
bordered pits
imperforate ends
conifers
very long
large, prominent bordered pits on radial walls
hardwoods
short fibrous cells
as long as the vessel elements
associated
small bordered pits
types
Vasicentric Tracheids
irregularly-shaped
fibrous cell
short
noticeable bordered pits
large earlywood vessel
certain spp
present in large numbers
not arranged in longitudinal rows
unlike vascular tracheids
Vascular Tracheids
specialized cells
certain hardwoods
similar to small vessel elements
size
shape
arrangement
but have imperforate ends
Ray Tracheids
cells w/ bordered pits
devoid of living contents
found in wood rays
most softwood
Resinous Tracheids
shapeless deposits
resinous materials
black
reddish-brown
Strand Tracheids
coniferous elements
from further cell division
longitudinal tracheid
longer
FIBER
elongated cell
pointed ends
thick wall
types
Fiber Tracheid
fiber-like cell
pointed ends
bordered pits
lenticular - slit like apertures/holes
general term
fibers w/ bordered pits
angiosperms
latewood tracheids
gymnosperms
Libriform Fibers
elongated
thick-walled cells
simple pits
longer
cambial fusiform initials
wood angiosperms
AXIAL PARENCHYMA
aka longitudinal parenchyma
from fusiform cambial initials
types
Axial Strand Parenchyma
cell
arranged in a row along the grain
formed thru further (postcambial) division
fusiform initial
cambium
Fusiform Parenchyma Cells
from longitudinal cambial initial
w/o subdivision
shorter fiber shape
Fusiform Cambial Initials
cambial initials
repeated division
give rise
radially-oriented row
longitudinal elements
xylem
phloem
Cambial Initials
individual cells
cambium layer
EPITHELIAL CELLS
excreting cells
surround cavities
resin canals
gum canals
RAY PARENCHYMA
parenchyma cells
included
wood rays
in contrast
longitudinal parenchyma
extend along the grain
types
Procumbent Ray Cells
narrow cells
elongated in direction of ray
composes
homocellular rays
one kind ray cell
body of heterocellular rays
hardwood
2 kinds
procumbent cells
upright cells
softwood
ray parenchyma
ray tracheids
Upright Ray Cells
short, high cells
2x height of ordinary ray cell
on margins of wood rays