178 FIELD COLUMBIAN MUSEUM BOTANY, VOL. i. 



Li. tremelloides (Linn, f.) Fr. 



On sandstone rock (Nuttall, 1093). 



Li. chloromelum stellans Tuck. 



On Quercus coccinea, alt. 2,400 ft. (Nuttall, 1146). 



LECANORE.E. 



PLACODIUM DC. 



P. elegans (Link.) DC. 



On sandstone boulders at base of cliffs, alt. i , 800 ft. (Nuttall, 862). 



~P. CERINUM (Hedw.) Naeg. & Hepp. 



Monongalia Co., on bark of beech, Falling Run (Millspaugh, 

 I 357)- O n Robinia Pseudacacia, alt. 2,000 ft. (Nuttall, 1030). 



P. ferrugineum (Huds.) Hepp. 



On top of wet sandstone rock (Nuttall, 1092). 



P. camptidium, Tuck. 



On trees (Nuttall, 1786). 



LECANORA, Ach. 



Li. coarctata Ach. 



On pieces of sandstone under drip of wet cliff, alt. 1,800 ft. 

 (Nuttall, 1780). 



Li. subfusca (Linn.) Ach. 



On trees and rocks (Nuttall, 1038). 



L. ATRA (Huds.) Ach. 



Monongalia Co., on bark Liriodendron log, newly felled, Falling 

 Run (Millspaugh, 1342). On flat exposed surface sandstone rock, 

 same locality (1287). 



L. deplanans Nyl. 



On rocks in bed of creek, alt. 1,300 ft., Fayette Co. in Short 

 Creek (Nuttall, 1126). 



Li. varia (Ehrh.) Nyl. 



On trees (Nuttall, 1036). 



/ 

 L. pallescens (Linn.) Schaer. 



On trees and rails (Nuttall, 937). 



Li. tartarea (Linn.) Ach. 



On sandstone rocks (Nuttall, 886). 



L. cervina (Pers.) Nyl. 



The light colored form on wet rocks; the dark form on dry 

 rocks (Nuttall, 854). 



Xj. privigna (Ach.) Nyl. 



On sandstone rocks (Nuttall, 1028). 



