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H. Liesebach
Institute of Forest Genetics, Johann Heinrich von Thünen Institute (Federal Research Institute for Rural Areas, Forestry and Fisheries), Eberswalder Chaussee 3A, D-15377Waldsieversdorf, Germany
B. Götz
Forest Botanical Garden, University of Applied Sciences Eberswalde, Am Zainhammer 5, D-16225Eberswalde, Germany