LICHENS. 977 
PLACODIUM Ach. 
Placodium aurantiacum (Lightf.) Naeg. & Hepp. 
On limestone rocks. Lawrence County (Peters). 
Louisianian to Alleghenian area. Texas to Georgia, north to Virginia, New Jersey, 
and New England; Illinois, Missouri, Arkansas, California. Europe. 
Placodium cinnabarinum (Ach.) Anzi. 
Onrocks. Lawrence County (Peters). 
Carolinian to Alleghenian area. North to New England and Ohio, west to Texas, 
Kansas, and California. 
Placodium ferrugineum (Huds.) Hepp. 
On limestone rocks. Lawrence County (Peters). Mobile County, Citronelle (Baker 
§ Earle), on dead wood. 
Louisianian to Alleghenian area and Boreal region. Texas to North Carolina and 
Virginia, Illinois, California, Alaska. Europe. 
Tribe COLLEMEAE. 
LEPTOGIUM Ach. 
Leptogium lacerum (Sw.) Fr. 
On limestone rocks, among mosses. Winston County (Peters). 
Carolinian and Alleghenian areas. Mountains of Alabama, through the Middle 
States, Ohio to Maryland, Canada. Europe. 
Leptogium apalachense (Tuck.) Nyl. 
Limestone rocks and trunks. Lawrence County (Peters). 
Carolinian area. Georgia, Missouri. 
Leptogium pulchellum (Ach.) Nyl. Collema corticola Tayl. in coll. Peters. 
On trees. Winston County (Peters; Mohr, 1880). Lee County, Auburn (Baker &§ 
Earle). 
Carolinian and Alleghenian areas. Texas, mountains of Georgia, South Carolina; 
Ohio Valley toNew England, Canada. South America(New Granada), South Europe. 
Leptogium tremelloides (L. f.) Fr. 
Trunk and roots of trees throughout the State. MobileCounty. Winston County 
(Peters). 
Louisianian to Alleghenian area. New Mexico and Texas to Florida, north to 
Canada. Europe. 
Leptogium marginellum (Sw.) Mont. 
On trees. Conecuh County (Beaumont). 
Louisianian area. Texas to Florida. West Indies, Mexico. 
Leptogium juniperinum Tuck. 
On the ground, open woods. Winston County (Peters; Mohr, 1880). 
Carolinian area. Tennessee, Illinois, Massachusetts. 
Leptogium chloromelum (Sw.) Nyl. 
Trunks. Lee County, Auburn (Baker § Earle). Lawrence County (Peters). 
Louisianian to Alleghenian area. Texas to Florida, South Carolina to Virginia, 
Ohio Valley, New England, Canada. Europe. 
Leptogium myochroum saturninum Schaer. 
Mountainous woods, trunks. Lawrence County (Peters). Lee County, Auburn 
(Baker § Earle). Etowah County near Gadsden (Moh). 
Carolinian and Alleghenian areas. New Mexico to South Carolina, north to New 
England. 
Leptogium muscicola (Sw.) Fr. 
Mountain region. On mosses. Lee County (Baker J: Earle). 
Carolinian to Alleghenian area. New England, California, British Columbia, 
Bering Strait. Europe. 
