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PLB 171   Visual Material  Instructor: Ellen Sutter,   Professor, Dept. of Pomology  E-mail: egsutter@ucdavis.edu  Phone: 752-0925		A. Specialized Structures 1. Bulbs - Tunicate/Nontunicate 2. Corms 3. Tubers 4. Tuberous Stems 5. Rhizomes 6. Pseudobulbs 7. Tuberous Roots B. Layering and Modifications 1. Tip Layering 2. Simple Layering 3. Compound Layering 4. Trech Layering 5. Air Layering