Above:  White oak, most of the time have all but the current growth increment plugged.

Above: White oak with all but current growth increment plugged.

A California White Oak.  A radial view. The balloon like structures in the vessels are tyloses.

Above: Maple with plugged vessels.  A Transverse Section

Above:  A radial view of maple with plugged vessels.

Source SHIGO 2002 CD's

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