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Leaf morphology of in vitro leaves of the diploid original clones (A) P. tremula × P. tremuloides (27-01), (B) P. nigra, (C) P. trichocarpa × P. deltoides and the fusion lines (D) 27-09, (E) 27-10, (F) 27-11, (G) 27-12. (The white scale bar at the bottom of the pictures measures 1 cm in length. Plants were subcultured for 4 weeks).
