1. Branchlet with young shoots, male catkins (a - d) and female inflorescences (e). - 2. Mature leafy shoot with ripe fruits. Fruits are almost sessile in small groups up to five; the lower half of the acorns are enclosed by the cup. - 3. Ripe acorn. - 4. Empty cup. - 5. Winter-branchlet. After Hempel & Wilhelm, 1889. Photos and explanations from the book: Zelimir Borzan. "Tree and Shrub Names in Latin, Croatian, English, and German, with synonyms", University of Zagreb, 2001.
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