HAUNTS AND HABITS OF FERNS. 7 



list. Even in the streets of our Southern cities, Polypodium in- 

 canum is commonly seen growing with various mosses well up 

 on the trunks of shade-trees. It is only in tropical regions, 

 however, that epiphytes are seen in profusion. 



1 9. These principles of climatic distribution are necessarily 

 modified by the geographic range of species, which must be 

 considered in this connection. For example, Asptdium spinu- 

 losum or its varieties form the leading foliage ferns of Northern 

 New England and New York, while Dicksonia, less common in 

 those localities, largely replaces them from Connecticut south- 

 ward. This subject will be more fully discussed in a later 

 chapter. 



LITERATURE. 



Most of the American literature bearing on this subject is in 

 the form of short notes which have appeared from time to time 

 in our two botanical monthlies ;* a classified summary appears 

 below : 



HABITS. Botanical Gazette, I, 2 ; II, 100 ; in, 82 ; IV, 140, 177, 

 232; v, 27, 30, 43, 48; vi, 161, 295 ; vii, 86. 



DIMORPHISM. Torrey Bulletin, vm, 101, 109 ; IX, 6 ; xin, 62. 



FORKING FRONDS. Botanical Gazette, i, 50; 11, 80; 111,39; 

 vi, 220; vm. 242. Torrey Bulletin, VII, 26, 85; IX, 116, 129; 

 x,4. 



RELATIVE ABUNDANCE : 



DAVENPORT (George E.). A Bit of Fern History. In 

 Botanical Gazette, vii, 60-64 (May, 1882). 



CULTIVATION : 



ROBINSON (John). Ferns in Their Homes and Ours. 1 2mo, 

 illustrated. Salem, 1878. A valuable outline of fern cultiva- 

 tion, indispensable to those desiring to undertake the cultivation 

 of ferns either in conservatories or Wardian cases. 



SMITH (John). Ferns, British and Foreign. 8vo. Lon- 

 don, 1879. 



* Students of ferns, like other botanists, ought to have these valuable 

 journals at hand as a means of keeping abreast of the wonderful botanical 

 activity now manifest in America. The Botanical Gazette, now (1888) com- 

 mencing its thirteenth volume, is published at Crawfordsville, Indiana ($2.00 

 per annum). The Bulletin of the Torrey Botanical Club, now commencing 

 its fifteenth volume, is published at Columbia College, New York City ($1.00 

 per annum). 



