Microscopic view of adventitious root cross sections 26 days after transplanting. A. Fibrous root (FR) cross section. B. Initiated storage root (ISR) cross section. Tissue sections were taken at 3 cm from the proximal root part and stained with toluidine blue. LC – lignified cells; AC – anomalous cambium; RVC – regular vascular cambium. Scale bars = 0.1 mm.