"Relatively more important from the practical point of view is variation caused by the presence of defects such as knots, spiral grain, compression and tension wood, shakes, and pitch pockets. "http://www.dict.cc/?s=harzgalle
: pitch pockethttp://www.highmountainforest.com/page.html?id=8
"Pitch pocket – a typically lens-shaped space, containing liquid or solid resin, that extends parallel to the annual growth ring in certain coniferous woods." http://www.nachi.org/forum/f23/can-natural-kn...
"PITCH is an accumulation of resinous material. It may be light, medium or heavy, as shown by its color and consistency.
MASSED PITCH is a clearly defined accumulation of solid pitch.
A PITCH POCKET is a well defined opening in the wood fiber which holds, or has held, pitch."http://www.websters-online-dictionary.org/def...
"resin pocket Synonyms (sorted by strength) resin gall, pitch pocket. "