LICHENS. 271 
Opegrapha vulgata (Ach.) Nyl. 
Barks throughout the State. 
Louisianian to Alleghenian area. North to Canada. Europe. 
Opegrapha varia (Pers.) Fr. 
On barks. Over the State, common. 
Louisianian to Alleghenian area. North to Canada. Europe. 
Family LECIDEACEAE. 
Tribe LECIDEAE. 
RHIZOCARPON Stitz. 
Rhizocarpon colludens (Fr.) Nyl. Lecidea myrini Fr. 
On rocks. Lee County, Auburn (Baker §: Earle). 
Carolinian and Alleghenian areas. New Jersey, Ohio, New England. 
Rhizocarpon subconcentricum Fr. 
On rocks. Lee County, Auburn (Baker § Earle). 
Carolinian area. 
BUELLIA De Not. 
Buellia parasema (Ach.) Th. Fries. 
Barks. Throughout Mobile County, common. 
Cosmopolitan from tropical to Arctic zones. Europe. 
Buellia subdisciformis Lightf. 
On bark. Mobile County, Citronelle (Baker). 
Louisianian area. 
Buellia disciformis Fr. 
On barks. Mobile County, Citronelle (Baker). 
Louisianian and Carolinian areas. Ohio. Europe. 
Buellia spuria Schaer. Buellia lactea Tuck. 
Mobile County, Citronelle. (Baker). 
Louisianian to Alleghenian area. Georgia and Tennessee to New England. 
Buellia subpostumum Nyl. 
On barks. Mobile County, Citronelle (Baker). 
LECIDEA Ach. 
Lecidea mamillaria Tuck. 
Mountain region. Winston County (Peters). 
Lecidea tessellina Tuck. 
Winston County (Peters). 
Lecidea contigua Fr. 
On rocks. Winston County (Peters). 
Carolinian and Alleghenian areas. New Jersey, New England, Canada. Europe. 
Lecidea enteroleuca Fr. 
Lee County, Auburn (Baker §: Earle). Mobile County. 
Louisianian, Carolinian, and Alleghenian areas. New Jersey, Maine, Canada. 
Kurope. 
HETEROTHECIUM Flot. 
Heterothecium tuberculosum (Fée) Flot. 
Conecuh County (Beaumont, Tuck. Gen. 75). 
Western Europe. 
Heterothecium pachycheilum Tuck. 
Conecuh County (Beaumont). ; 
Louisianian area. Louisiana to South Carolina. Cuba. South America. 
