Softwood anatomy.

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Presentation transcript:

Softwood anatomy

Longitudinal tracheids

Earlywood and Latewood

EW-LW transition - abrupt Latewood Earlywood

EW-LW transition - gradual Latewood Earlywood

EW-LW transition - intermediate Latewood Earlywood

EW-LW transition - abrupt Latewood Earlywood Latewood Earlywood Latewood Earlywood

EW-LW transition - gradual Latewood Earlywood Latewood Earlywood

EW-LW transition - intermediate Earlywood Latewood Earlywood Latewood

EW-LW transition - abrupt Earlywood Latewood

EW-LW transition - gradual Earlywood Latewood

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 Large resin canals Small resin canals Non-resinous

Resin canals White pine Lodgepole pine Spruce Douglas-fir

Resin canals Large resin canals Small resin canals Non-resinous

Resin canals Traumatic Paired Multiple

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 bordered pits between ray ray tracheid dentations tracheids ray tracheid dentations bordered pits between ray tracheids and longitudinal tracheids semi-bordered pits

Hardwoods

Red alder – aggregate rays

Red alder – aggregate rays

Genuine mahogany Red lauan

Red lauan – gum ducts