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