260 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



different species of Cladonia and the prairie bowlders, when left 

 undisturbed, are strangely mottled by the variously colored, mostly 

 crustose lichens. Some of these are very beautiful objects when 

 seen under a lens. 



Mosses are among Nature's most beautiful handiwork. We will 

 find this to be true whether we look at the luxuriant green carpet 

 that lines the cool shady lake bank or hillside, or at an individual 

 plant through a lens or a microscope. Though some kinds are very 

 common in more open grassy woodlands, the largest number of 

 species and the most luxuriant growth are found along shaded lake 

 banks and hillsides facing an exposure away from the sun. To the 

 nature lover such situations are often most enchanting, especially in 

 early spring and during rainy days of autumn. 



The author realizes that this list is far from complete. It is the 

 result of odd hours spent in collecting on infrequent occasions and 

 with long intervals. Another season of more systematic work would 

 no doubt have added many species, and if this had been possible 

 the publication of the paper would have been delayed until it could 

 have been made more complete. However, it is believed that the 

 list is fairly representative of the region and it is, therefore, pre- 

 sented with the hope that it may be of interest and assistance to 

 some one who may, in the future, undertake the study of the lichen 

 and moss flora of this or adjacent counties or localities. The writer 

 knows of no other moss list for this section of the state. The lichen 

 flora is fairly well represented in Professor Shimek's "The Plant 

 Geography of the Lake Okoboji Region." 



The writer has not depended on his own determination in making 

 up this list. In order to add to the value of the paper duplicates 

 of all the specimens collected, even of the common and well-known 

 forms, have been submitted to the different curators of the her- 

 bariums of the Sullivant Moss Society. 



The author is indebted to Miss Mary F. Miller, of Washington, 

 D. C, formerly curator of the Lichen Herbarium, for the deter- 

 mination of the specimens of his earlier collections, and to the pres- 

 ent curator, Mr. C. C. Plitt, of Baltimore, for the later collections. 

 The mosses have been determined by Mr. George B. Kaiser, of Ger- 

 mantown, Pennsylvania, curator of the Society Moss Herbarium.. 



LICHENS 



The greater number of lichens listed below were collected in the 

 High lake vicinity. This will include most of the species growing 

 on trees. On the other hand nearly all the rock-loving species were 



