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Pannaria conoplea is a foliose lichen species characterized by its distinctive blue-gray to brownish thallus with a feltlike underside and prominent apothecia. This epiphytic lichen plays a crucial ecological role in forest ecosystems by contributing to nutrient cycling and providing microhabitat for invertebrates while serving as an indicator of air quality and old-growth forest conditions.

This lichen grows primarily on the bark of mature deciduous trees, particularly in humid old-growth forests and well-established woodlands with stable microclimates. It favors locations with consistent moisture levels and clean air, often found in sheltered valleys and areas with minimal human disturbance.