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Transverse section of a stem of Psaronius

Transverse section of a trunk of Psaronius with a fairly complex structure of the xylem
bundle and a rather thick root mantle. These are characteristics of a part halfway the trunk.

The C-shaped structures around the central strand are transverse sections of petioles.
Photo R Rößler. Coll. Museum für Naturkunde, Chemnitz.