PLANTS OF IOWA ,,_. 



1199. P. crinita, Ach. 



Trees and rocks; common. 



1200. P. tiliacea, (Hoffm.) Floerk. 

 Trees and rocks; infrequent. 



1201. P. borreri, Turn. 

 Trees; frequent. 



1202. P. borreri, Turn., var. riuhcta, Tuck. 

 Trees. 



1203. P. saxatilis, (L.) Fr. 

 Trees and rocks. 



1204. P. saxatilis, L. Fr. var. sulcata, Nyl. 

 On trees, rare. 



1205. P. olivacea, (L.) Ach. 

 Trees. 



1206. P. olivacea, L. Ach., var. aspinota, Ach. 

 On trees, infrequent. 



1207. P. caperata, (L.) Ach. 

 Trees and rocks. 



1208. P. conspersa, (Ehrh.) Ach. 

 Rocks. Rare. 



Physcia, (DC, Fr.) Th. Fr. 



1209. P. speciosa, (Wulf., Ach.) Nyl. 

 Trees and mossy rocks. 



1210. P. hypoleuca, (Muhl.) Tuck. 

 Trees, frequent. 



1211. P. gramdifera, (Ach.) Tuck. 

 Trees. Common. 



1212. P. comosa, (Eschw.) Nyl. 

 Red Cedar, along bluffs. 



1213. P. aquila, (Ach.) Nyl. 



Rocks. Probably the variety detonsa occurs. 



1214. P. pulverulenta, (Schreb.) Nyl. 

 Trees and rocks. 



1215. P. stellaris, L. 



Trees and rocks; common. 



1216. P. tribacia, (Ach.) Tuck. 



