140 
IOWA ACADEMY OF SCIENCES. 
imbia sp , Cladonia pyxidata var. chlorophcea and Cladonia 
dmbriata var. coniocrcea , which has hitherto been reported 
in Iowa under Cladonia fimbriata var. tubmformis , and 
which likewise included Cladonia fimbriata apolepta , also 
found at “ The Ledges.” Most of the forms found here 
have good cellular cortices, and the thalli are larger and 
better developed than the thalli of the same species which 
grow in more exposed places. 
The following list of lichens is the collection made at 
“ The Ledges ” last summer by Miss Charlotte King and 
Dr. Bruce Fink. In my determinations I am much 
indebted to Dr. Fink for help in some particularly difficult 
forms, and also for the use of his lichen herbarium for 
purposes of comparison and reference. 
A set of the lichens herein listed is placed in the herba- 
rium of the Iowa State college at Ames. 
Ramalina calicaris (L.) Fr. var. fraxinea (L.) Fr. Lich. 
Eur. 80. 1881. 
On sandstone and trees, rare. 
Ramalina calicaris (L.) Fr. var. fastigiata (Pers.) Fr. 
Lich. Eur. 80. 1831. 
On sandstone and trees, common. 
Ramalina calicaris (L.) Fr. var. farinacea. (L.) Pr. Lich. 
Eur. 81. 1881. 
On sandstone, rare. 
Usnea barbata Fr. Sched. crit. Lich. Suec. 8:84. 1826. 
On sandstone, infrequent. 
Theloschistes polycarpus (Ehrh.) Tuck. Syn. 1:50. 1882. 
On trees, rare. 
Theloschistes lychneus (Ach.) Th. Fr. Lich. Scand. 
1:146. 1871. 
On trees, rare. 
Theloschistes concolor (Dicks.) Th. Fr. Scand. 1:147. 
1871. 
On trees, rare. 
Parmelia crinita Ach. Syn. Meth. Lich. 196. 1814. 
On sandstone, common. 
Parmelia tiliacea (Hoffm.) Ach. Meth. Lich. 215. 1808. 
On trees, infrequent. 
