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Nacrtak False heartwood, as the phenomenon considerably affecting the quality of beech logs and trees, has been the object of professional and scientific interest for more than 100 years. Occurrence and characteristics of false heartwood were investigated depending on diameter class of average trees and type of cut in beech stands on a sample of 2308 trees. The age of trees in thinnings ranges between 50 and 91, in preparatory cuts between 96 and 111, in seeding cuts between 101 and 112 and infatcat:t7svhj4oq5aajktqply3jske3e