Softwood anatomy

1
Softwood anatomy
2
Longitudinal tracheids
3
Earlywood and Latewood
Earlywood
Latewood
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EW-LW transition - abrupt
Latewood
Earlywood
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EW-LW transition - gradual
Latewood
Earlywood
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EW-LW transition - intermediate
Latewood
Earlywood
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EW-LW transition - abrupt
Latewood
Earlywood
Latewood
Earlywood
Latewood
Earlywood
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EW-LW transition - gradual
Latewood
Earlywood
Latewood
Earlywood
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EW-LW transition - intermediate
Earlywood
Latewood
Earlywood
Latewood
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EW-LW transition - abrupt
Earlywood
Latewood
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EW-LW transition - gradual
Earlywood
Latewood
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Growth ring width variation
Three very different growth rates (Douglas-fir
all shown at the same magnification)
13
Bordered pits
Inter-tracheid bordered pit
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Bordered pits
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Bordered pits less common arrangements
Paired
Alternate
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Longitudinal parenchyma
17
Longitudinal parenchyma
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Resin canals
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Resin canals
Large diameter
Small diameter
20
Resin canals
Large resin canals
Small resin canals
Non-resinous
21
Resin canals
White pine Lodgepole pine
Spruce Douglas-fir
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Resin canals
Large resin canals
Small resin canals
Non-resinous
23
Resin canals
Traumatic
Paired
Multiple
24
Rays uniseriate rays
Uniseriate rays
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Rays fusiform rays
Fusiform ray (including horizontal resin canal)
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Rays fusiform rays
Fusiform ray (including horizontal resin canal)
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Spiral thickening
Spiral thickening on inside of cell wall
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Spiral thickening
Spiral thickenings
29
Cross-field pitting
30
Cross-field pitting
Lodgepole pine
White spruce
Red pine
Douglas-fir
31
Cross-field details
bordered pits between ray tracheids
raytracheiddentations
bordered pitsbetween ray tracheids
andlongitudinaltracheids
semi-bordered pits
32
Hardwoods
33
Red alder aggregate rays
34
Red alder aggregate rays
35
Genuine mahogany
Red lauan
36
Red lauan gum ducts