I. adversum I. aversa I. coronata I. elveloides I. ericetorum I. splachnirima Icmadophila is a genus of crustose lichen.

The genus has a widespread distribution in the Northern Hemisphere and contains six species.

[2] The only species found in North America, Icmadophila ericetorum, has a mint green crustose thallus that is dotted with bright pink apothecial disks, and is sometimes colloquially referred to as "fairy puke".

[3] It aggressively grows over mosses on well-rotted wood and peat.

[4] It looks very distinctive, but may be confused with species of Dibaeis.