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Fraxinus excelsior L.
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English Ash
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Oleaceae
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Transversal section |
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Ring-porous. Pore size varies with growing location. Earlywood pore ring occasionally loosely packed. Latewood pores solitary or in short radial multiples (mostly one to two pores), rarely in small groups. Thick-walled latewood vessels. Paratracheal, vasicentric, and sometimes indistinct tangential bands of parenchyma. When heartwood present, earlywood vessels occasionally with tyloses. |
             
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Radial section |
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Simple perforation plates. Homogeneous rays and rarely heterogeneous with one row of square marginal cells. In ray-vessel intersections numerous small pits. Axial parenchyma: Short, square to rectangular cells in proximity of latewood vessels, elongated cells away from vessels. Libriform fibres present, fibre-tracheids absent. |
   
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Tangential section |
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Generally bi- and triseriate rays, average ray height: 10 to 15 cells, up to 20 cells. |
   
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Key characters |
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Ring-porous. Latewood vessels thickwalled, solitary and often in radially paired multiples. Rays bi- to triseriate. |
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