LICHENS. 283 
Tribe USNEAE. 
. USNEA <Adans. 
Usnea barbata (L.) Fr. 
On trees and dead wood; common throughout. 
Louisianian area to Boreal region. From the Gulf to Arctic America, Europe. 
Usnea barbata florida Fr. 
Dry open woods. Common over the State. 
Louisianian to Alleghenian area. Irom the Gulf to Canada. 
Usnea barbata rubiginea Michx. 
On trees. Mobile County and over the State. 
Louisianian to Alleghenian area, East United States to Canada, Enrope. 
Usnea barbata dasypogon Fr. 
On trees. Open woods in the mountains. Winston County (J/elers). 
Carolinian to Alleghenian area. North to Canada, 
Usnea trichodea Ach. 
On trees. Mountain region, Cullman County. 
Carolinian to Alleghenian area. North to New England and Nova Scotia. 
CETRARIA Ach. 
Cetraria fendleri Tuck. 
On old trees. Mobile County. Lawrence County (Peters). 
Louisianian and Carolinian areas. South Carolina, New Jersey, and Maryland, 
west to Colorado, 
Cetraria aurescens Tuck. 
On trees. Lawrence County (Peters). 
Carolinian and Alleghenian areas. New Jersey, New England. 
RAMALINA Ach. 
Ramalina rigida (Pers.) Ach. 
On old trees. Mobile County. 
Louisianian and Carolinian areas. Texas, Louisiana to Florida, and along the 
coast to New Jersey and New England. Mexico. 
Ramalina laevigata Fr. 
On trees. Mobile County, not rare. 
Louisianian area. Texas, New Mexico, South Carolina. Mexico, 
Ramalina calicaris (L.) Fr. 
Old sickly trees. Mobile County, frequent. 
Louisianian to Alleghenian area, Throughout the Eastern United States, Canada, 
Europe. 
Ramalina calicaris canaliculata Ir. 
Trees. Mobile County. 
Louisianian to Alleghenian area, Mexico, 
