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Development of Recent Types of Steles in Pteridophytes and Seed Plants



green: xylem, blue: phloem. Eustele, siphonostele (upper row), polystele (middle row)and aktinostele (lower row) are all derived from the protostele (according to W. ZIMMERMANN, 1959)

© Peter v. Sengbusch - b-online@botanik.uni-hamburg.de