The results showed that all the parenchyma cell lumens of blue-stain wood were occupied by fungi hyphae or mycelia,and blue-stain always occured in the depth of wood.

• 研究结果表明:白桦蓝变材的变色是由变色菌侵蚀木材引起的,变色深入木材内部。木材薄壁细胞腔内充满了大量的变色菌丝体,菌丝体本身的颜色及其分泌的色素是木材变色的原因。