Small thallus of tiny flattened lobes; 2–4 mm wide, pale green to gray. Upper surface with small net-like ridges and isidia, underside with black rhizines (small stiff hairs). Apothecia brown, but not always present. In many habitats including coniferous and hardwood forests, rocks and logs in upper tidal zones and alpine areas. Seven species of Parmelia occur in this region.