Common walnuts (Juglans regia), native to Southern Europe and AsiaBeech tree (Fagus sylvatica) covered in hoarfrost, BelgiumNorway maple tree (Acer platanoides) in autumn colours, BelgiumTrees in the mist in broad-leaved forest Hazelnuts (Corylus avellana), Belgium Male hazel catkins (Corylus avellana), BelgiumRed berries of European Rowan / mountain ash (Sorbus aucuparia), BelgiumFallen beech tree (Fagus sylvatica) exposing roots in autumn forest, GermanyBranches of treetop covered in snow in winter, Belgium