Woodland Scenics Medium Green Lichen Small Bag - 86.6 in³ (141 cm³) This natural product is a longtime favorite of hobbyists. Its unique texture realistically blends easily with other foliages. It is non-toxic, non-flammable and hygroscopic. Use for any scale to model bushes, moss and other ground cover, or use as tree foliage to model quick and economical tree masses. Lichen is available in five solid colors and three mixes. Attach to Tree Armatures with Hob-e-Tac®. Attach to layout with Scenic Glue™.