PLANTS OF IOWA 99 



PANNARIA, Delis. 



1231. P. languinosa, (Ach.) Koerb. 



Shaded calcareous rocks and sandstone. 



1232. P. microphylla, (Sw.) Delis. 

 Sandstone. 



1233. P. petersii, Tuck. 

 Calcareous rocks. 



1234 P. nigra, (Huds.) Nyl. 

 Calcareous rocks. 



1235. P. nigra, Nyl., var. ccesia, Nyl. 

 On calcareous rocks, rare. 



COLLEMEI FAMILY. 



OMPHALARIA, (Dur.) Mont. 



1236. 0. pulvinata, Nyl. 

 Calcareous rocks. 



1237. 0. umbella, Tuck. 

 Calcareous rocks. 



COLLEMA, (Hoffm.) Fr. 



1238. C. pycnocarpum, Nyl. 



Dead trees in moist wooded ravines. 



1239. C. flaccidum, Ach. 



Trees and calcareous rocks. 



1240. C. pulposum, (Berhm.) Nyl. 

 Calcareous earth and rocks. 



1241. C. tenax, (Sw.) Ach. 

 Calcareous earth and rocks. 



1242. C. crispum, Barr. 

 Earth. 



1243. C. plicatile, Schaer. 

 Calcareous rocks. 



1244. C. furvum, (Ach.) Nyl. 

 Calcareous rocks. 



1245. C. pustulatum, Ach. 

 Calcareous rocks. 



1246. C. nigrescens, (Huds.) Ach. 

 On old logs, rare. 



