Discoloration of sapwood due to fungus.
A fungus discoloration, predominantly bluish, but sometimes grayish, blackish, or brownish in appearance; confined almost exclusively to sapwood; common in pines.
a deep-seated discolouration of wood resulting from fungus attack; predominantly bluish but sometimes having a grey or brown tint; confined almost exclusively to sapwood.
Discolouration of wood or sawn timber caused by blue stain fungus
A fungus discoloration, mostly bluish, but somtimes grayish, blackish, or brownish in appearance; found mostly in sapwood, common in pines and in the warmer months of summer. At one time this was thought to be a serious defect; now it is used as high-quality interior finish
Result of humidity and temperature. Can occur naturally or be caused by fire - a fungus that grows within a log.
A blue or gray discoloration in sapwood caused by mildew infection.
A bluish or grayish discoloration of the sapwood caused the growth of certain mold like fungi on the surface and in the interior of a piece, made possible by the same conditions that favor the growth of other fungi.