Georgia Wildlife Resources Division
2070 U.S. Hwy. 278, SE, Social Circle, GA 30025
Download the Lichens of Georgia poster here [1].

Lichens species in Georgia include:
Cladonia rangiferina
Cladonia caroloniana
Crytothecia rubrocincta
Dibaeis baeomyces
Ochrolechia africana
Umbilicaria mammulata
Sticta beauvoisii
Buellia spuria
Cladonia evansii
Cladonia leporina
Xanthomendoza fulva
Physcia pumilior
Teloschistes exilis
lobaria pulmonaria
parmotrema hypotropum
Ramboldia russula
Parmotrema submarginale
Hypotrachyna livida
Lasallia papulosa
Usnea strigosa
Links:
[1] http://www.georgiawildlife.com/sites/default/files/uploads/wildlife/nongame/pdf/Lichen poster complete web.pdf