A Rocky Mountain Lichen Primer is an introduction and field guide to lichens in the Rocky Mountain region. It features seventy-two color plates picturing the most common and conspicuous species to be found in the mountains and foothills of the Rockies. Many of these lichens are also common in other geographic areas, giving the book a broader utility for those interested in lichens elsewhere. In addition to the plates, A Rocky Mountain Lichen Primer contains a brief description of each species to assist in identification, along with a general introduction to lichens and their structure. The book is tailored to the novice, and includes a section on beginning a lichen collection.