Microscopic characteristics of dicotyledonous wood

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Vessels (Pores)

A tube-like series of water-conducting cells (with bordered pits) which are axially joined by perforation plates in the cell end walls.
The vessels in cross-sections are called pores.


t tangential
q transversal


me medium
mo modest

  Ring porous:
The diameter of the pores in the earlywood is much greater than the diameter of the pores in the latewood.
q h
  Semi-ring porous:
The pores in the earlywood are more numerous and distinctly larger than those in the latewood. The semi-ring porous state may be induced by water-deficiency; thus this anatomic characteristic is of little value for diagnostic purposes.
q me
  Diffuse porous:
The pores of the earlywood and latewood are approximately the same size.
q h
  Solitary pores:
Pores which in general are not in contact with other pores.
q me
  Radial pore files:
Several pores joined in radial groups, the number of pores in a group varying according to the species.
q h
  Pore cluster:
Three or more pores irregularly grouped.
q me
  Flame-like, radial distribution of pores. q h
  Radial orientation of pores. q h
  Oblique orientation of pores. q h
  Tangential orientation of pores. q h

  © / authors / citation / 12.05.04


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