Microscopic characteristics of dicotyledonous wood
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Parenchyma

    
 

Parenchyma:
Tissue composed of ± isodiametric cells and simple pits.

Apotracheal parenchyma:
Axial parenchyma not in direct contact with vessels.

Section

r radial
t tangential
q transversal

Diagnostic
Value
h high
me medium
mo modest

  
 
  Diffuse, apotracheal parenchyma:
Isolated parenchyma cells, irregularly dispersed among the fibers. 		q me
  Banded, apotracheal parenchyma:
In more or less continuous lines or tangential bands.		 q h
  Paratracheal parenchyma:
Axial parenchyma associated with vessels. 		     
  Circumvascular paratracheal parenchyma:
Parenchyma cells surround vessels. 		q h
  Traumatic parenchyma:
Cells of irregular size, form and distribution. Also called pith flecks. 		q me
  Parenchyma cells and vessels cannot be differentiated in the transversal section. q h
  Storied parenchyma. r me
 

Crystals in pith cells.

 

 q me
  Crystals in ray cells. t me
  Trapezoidal crystals (calcium oxalate) in parenchyma cells which have a special form: idioblasts. t me

  © / authors / citation / 12.05.04

 

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