178 Field Columbian MuseuiM — Botany, Vol. i. 



Ij. tremelloides (Linn, f.) Fr. 



On sandstone rock {^Nuttall, 1093). 



Xi. chloromelum stellans Tuck. 



On Que re us coccinea, alt. 2,400 ft. {^Nuttall, 1 146). 



LECANORE^. 



PLACODIUM DC. 



P. elegans (Link.) DC. 



On sandstone boulders at base of cliffs, alt. i , 800 f t. (iV////rt//, 862). 



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



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

 1357)- On 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. 



Xi. coarctata Ach. 



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

 {Nuita/l, 1780). 



Xi. subfusca (Linn.) Ach. 



On trees and rocks {Nutta//, 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). 



X. deplanans Nyl. 



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

 Creek {Nuttall, 11 26). 



X. varia (Ehrh.) Nyl. 



On trees {^Nuttall, 1036). 



L. pallescens (Linn.) Schaer. 



On trees and rails {^Nuttall, 937). 



X. 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). 



I*, privigna (Ach.) Nyl. 



On sandstone rocks yNuitall, 1028). 



