Physcia thrives in polluted air environments, so expect to see these lichens in big cities and near major roads.
There are several species of Physcia but there are only two that have whiskers on their lobes, and these are the ones to look out for in the survey.
- Lobes grey on top, whitish below
- Lobe ends raised up becoming powdery
- Black-tipped whiskers on the lobe edges