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along the southeastern coast. A fern hunter in Florida should 

 keep to the limestone and whenever it is shaded by oaks and bays 

 he may reasonably expect to find a good variety of ferns. The 

 only exception to this rule is in reality no exception, for the 

 Cheikmthes found near the northeastern corner of the State, 

 grew on shaded shell mounds. Nearly all the ferns found on the 

 limestone are West Indian species. Far to the south Pteris longi- 

 folia and Anemia adiantifolia grow where there is little or no 

 shade, like swamp ferns, but it is where the sea is so near as to 

 supply plenty of moisture. 



An important addition to the lime-loving ferns is found in 

 the epiphytic species, which are found in increasing numbers as 

 one goes southward. The natural laws governing the distribu- 

 tion of ferns by no means apply to the allied orders, which show 

 no liking for calcareous soil. 



In the following list are enumerated, I believe, all the species 

 thus far found in Florida. A few of these I have never seen. It 

 is highly probable that a number of other West Indian forms are 

 hidden away in the southern part of the State, waiting for some 

 one to come along and discover them : 



OpHIOGEOSS ACE AE. 



Ophioglossum pusillum Nutt. This I once found growing in 

 abundance just west of Jacksonville in a damp sandy spot with 

 Ludzcigia palustris, etc. It has also been found much farther 

 south. 



Ophioglossum crotalophoroides Walt. Manatee and Fernar- 

 dina. Not common. 



Ophioglossum vulgatum L. AdderstonguE. Not common. 



Ophioglossum palmatum Plumier. Rare. Found on the trunks 

 of trees, usually palmettos, in Southern Florida. 



Botrychium obliqaum Muhl. Grape fern. In low woods in 

 the northwestern part of the State. 



Botrychium Vifginianutn Sw. Rattlesnake fern. With the 

 preceding and probably confined to the same region. 



Hymenophyllaceae. 



Trichomanes Krausii Hook and Grev. Southern Florida. A. 

 A. Eaton. 



Trichomanes sphenoides Kze. Southern Florida. A. A. 

 Eaton. 



