This short review focuses on lichens which have cyanobacteria as their main photosynthetic partner or in localized areas termed cephalodia. Research is cited to show that cyanolichens are very sensitive to gaseous air pollution, to acid rain, and to habitat disturbance. These lichens are worth conserving for their own sake but are also valuable for assessing the status of forests in areas like northeastern North America, where forests cover large tracts of land. The richness of the cyanolichen flora reflects biological diversity in the forests. Cyanolichens fix atmospheric nitrogen, are generally nutrient-rich, and have a diverse associated invertebrate fauna. These invertebrates provide food that sustain both resident and migrating birds. Management strategies that might be used to maintain and ensure the survival of the rich cyanolichen flora of the northeastern U.S. and Atlantic Provinces of Canada are presented and discussed.