—107— 
far as I am aware, the only additions to systematic bryology in the way of 
new species that he made. In fact he was rather conservative in his views 
of species-making, being averse to divisions along lines of minute distinc- 
tion. In his explanatory note in connection with D. Bo7ijea?ii m Hedwigia, 
he says; “ I have not deemed it worth while to describe the forms of D. 
palustre, since they are connected with the swamp forms of D. scopariiim. 
If one did this he would be able to rival the lists of individual sphagna.” 
He is contented with a diagrammatic scheme showing the relationship of his 
three varieties and others of American or European origin, with D. 
scoparium, D. Bonjeani D. undulatiim. 
Aside from the interest in this little volume to me as a helpful 
companion in the familiar collecting ground of my home region, as well as to 
some extent in the neighboring state of Wisconsin, I prize it also as showing 
that Prof. Barnes was deemed worthy of association in the elaboration of 
Roll’s collection of mosses with some of the most distinguished contemporary 
bryologists of Europe. Chicago, 111 , May, 1910. 
MOSSES OF COOK COUNTY, ILLINOIS. 
By William Wirt Calkins. 
The following species of mosses growing within a radius of ten to twen- 
ty-two miles from Chicago have been collected by the writer during the last 
two years. The surface of Cook County being mainly prairie lands, cut 
through here and there by small streams or creeks, is not especially 
adapted to the growth of mosses; however, narrow belts of timber border 
the water-courses, and in several localities the Silurian limestone outcrop- 
pings afford congenial substrata for the propagation of some species, as, 
also, of several species of lichens. On the Lake Michigan shore, north of 
Chicago twenty-two miles, high bluffs of clay extend for several miles; these 
are from eighty to one hundred feet in height, are clothed with various trees, 
shrubs and grasses, and slope off rather abruptly to the shore. A number 
of ravines have been cut by water down through the bluffs and these sustain 
a primeval forest growth. Many rare plants are peculiar to these habitats 
and do not occur inland. The conditions here are favorable to mosses. The 
writer has not thus far explored fully the localities named and probably 
many other species than those named herein will be found. My friend, E. 
J. Hill, so well known as an eminent botanist, estimates the Cook County 
species of mosses at about fifty. It will be seen that I have located 
that number. My excuse for publishing the list now is, that I believe no 
enumeration has ever been made, hence, that my list will be of some value, 
and locally at least, call attention to this branch of our flora. I being only 
an amateur in the study of mosses, have had all species determined by 
competent authorities in order to give more value to the paper. It gives me 
pleasure to state my sense of obligation to the following; Mrs. Annie 
Morrill Smith; Miss Edith A, Warner; Mrs. Elizabeth M. Dunham; Miss 
Alice L. Crockett; Mrs. B. J. Handy; Prof. E. B. Chamberlain; Prof. E. J. 
Hill; Mr. C. C. Kingman; Rev. H. Dupret; Dr. Le Roy Andrews; Prof. N. 
L. T. Nelson; Mr. F. E. McDonald and Dr. Brenckle. 
