sawn beech tree, fagus sylvatica, with discoloration caused by fungal attack

area artificial attack bark beech black cambium carving caused chondrostereum cross dead discoloration fagus forest fungal fungus gelderland growth harskamp healthy holz joinery kootwijkerzand lines logs natural netherlands nonloadbearing ornamental pattern process processed purple purpureum rings sawn section side spalting spotty starting stocked structures sylvatica tree trunk turned used veluwe wood wooden woodturning years