Micro No. 40
by Dr. Richard Kessel & Dr. Gene Shih - Dr. Richard Kessel & Dr. Gene Shih / Visuals Unlimited - © Dr. Richard Kessel & Dr. Gene Shih/Visuals Unlimited/Corbis
This cross section of pine wood shows the epidermis
This cross section of pine wood shows the epidermis, periderm, cotex, phloem fibers, vascular cambium, and growth rings. **On Page Credit Required**