Icmadophila is a genus of crustose lichen. The genus has a widespread distribution in the Northern Hemisphere and contains six species. The only species found in North America, Icmadophila ericetorus, has a mint green crustose thallus that is dotted with bright pink apothecial disks, and is sometimes affectionately referred to as fairy puke. It aggressively grows over mosses on well-rotted wood and peat. It looks very distinctive, but may be confused with species of Dibaeis.