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Pseudotsuga menziesii (Mirb.) Franco
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Douglas Fir, Oregon Pine
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Pinaceae
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Transversal section |
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Early- to latewood transition generally rather sharp, but in fast growing trees from Europe, broad growth rings with continuous early- to latewood transition. Resin canals with thick-walled epithelial cells. |
        
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Radial section |
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Tracheid pits almost uniseriate, rarely biseriate. Rays heterocellular. Taxodioid pits (in earlywood) to piceoid (in latewood). Cross-fields from parenchyma cells to tracheids with 2 to 4 pits. Indentures present in horizontal ray parenchyma cell walls at junction with tangential end walls. Distinct, delicate spiral thickenings. |
   
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Tangential section |
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Average height of rays 8 to 15 cells, sometimes more. Rays occasionally biseriate. Round, thick-walled ray cells, in rays resin canals with thick-walled epithelial cells. |
   
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Key characters |
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Resin canals with thick-walled epithelial cells. Spiral thickenings. |
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Remarks |
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Intensively planted in Europe since approximatively 1850 (native to North America). |
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