Concentric Boulder Lichen

Concentric Boulder Lichen faces significant threats from air pollution, particularly acid rain and nitrogen deposition, which alter the chemical composition of its rocky substrates and disrupt its slow-growing crustose structure. Climate change poses additional risks through altered precipitation patterns and temperature fluctuations that affect the delicate moisture balance required for photosynthesis and growth. Habitat degradation from quarrying, construction activities, and recreational disturbance further threatens the stable rock surfaces this species depends upon.