Michael Wojtech, Naturalist, Author, and past Garden Club of the Back Bay speaker, will lead an Arnold Arboretum session on Saturday, February 10, 9:00am–1:00pm. Explore the wonderful variety of bark textures, shapes, thicknesses, and colors, which are always-visible clues to tree identity. Through presentations and a series of participatory exercises, learn how to identify tree species by their bark, and uncover why such a variety of bark characteristics exist. See, touch, smell, and trace the contours of bark to hone perceptive skills and deepen intimacy with trees and the places where they grow. Class will meet indoors and in the landscape of the Arnold Arboretum. Open to tree enthusiasts at all levels of experience. Michael will be available to sign copies of his book, Bark: A Field Guide to Trees of the Northeast. For more details visit: http://www.knowyourtrees.com. Fee $60 Arboretum member, $75 nonmember. Register at http://my.arboretum.harvard.edu or call 617-384-5277.