A CHECKLIST OF THE NORTH AMERICAN 

 FERNWORTS. 



{Continued.) 

 HYMENOPH YLLACE^E. 

 Trichomanes L. 



23. Trichomanes Krausii Hook, and Grev. Rare; on 

 roots and tree-trunks. Southern Florida; also 

 in the West Indies, Mexico and south to Peru 

 and Brazil. 



24- Trichomanes Petersii A. Gray. Rare; on moist 

 rocks. Confined to a few localities in Alabama, 

 Georgia and Mississippi. 



25. Trichomanes radicans Sw. Killarney Fern ; Filmy 



Fern. Rare; on moist rocks from Kentucky to 

 Alabama and Florida ; also throughout the warmer 

 parts of the world. — T. Boschianum Sturm. 



26. Trichomanes sphenoides Kunze. Very rare ; on wet 



rocks. Southern Florida; also in the West 

 Indies and the mainland of tropical America. 

 This species is sometimes referred to T. reptans 

 Sw. 



PARKERIACE^. 

 Ceratopteris Brong. 



27. Ceratopteris thalictroides (L.). Floating Fern. 



Rare; floating on the water even where it is 

 brackish. Florida and southern Louisiana; also 

 around the earth in the tropics from Mexico to 

 Brazil and from India to northern Australia. 



POLYPODIACE^E. 



ACROSTICHUM L. 



28. Acrostichttm aureum L. Rare ; in brackish swamps. 



Southern Florida; also in Bermuda, the West 

 Indies, Brazil and throughout the East Indies. 

 56 



