122 



THE FERN BULLETIN 



those that prefer shaded swamps, species of dry woods, 

 wet woods, on sandstones and shales, on limetones, in 

 sand, in clay, in alluvial soil, in stony soil. The soil 

 usually has considerable to do in determining the kinds 

 of terns growing in a certain locality. Some ferns can 

 grow in several different soils but others seem confined 

 to a single one. 



INDEX TO RECENT LITERATURE. 



Readers are requested to call our attention to any 

 errors in, or omission from, this list. 



Bacox, W. L. The Discovery of Crypto gramma 

 Stelleri in Maine. Rhodora F. 1908. 



Bessey, C. E. The Families of Fern-like Plants. 

 Fern Bulletin. Jl. 1008. 



Bourx, A. The Botryehinms of Dorset, Vermont. 

 Bulletin of Vermont Botanical Club. Ap. 1908. 



Billings, E. My Fernery. Bulletin of Vermont 

 Botanical Club. Ap. 190S. 



Clute, W, X. A New Form of Polypody. Fern 

 Bulletin. Jl. 1908. 



Clute, W. X. Checklist of North American Fern- 

 worts.- Fern Bulletin. O. 1907. — A continuation com- 

 pleting the list of ferns. 



Clute, W. X t . Changes in Fern Names. Fern 

 Bulletin, O. 1907. 



Clute, W. X". Fifteen Years of Fern Study. Fern 

 Bulletin, O. 1907. 



Clute, \Y. X". On Changes in the f auction of Di- 

 morphic Fronds, illust. Fern Bulletin. Jl. 1908. — Il- 

 lustrations of the fruiting of normally sterile pinnae 

 and of normally fertile pinnae that are sterile. 



