CLASSIFICATION AND NOMENCLATURE. 47 



Williamson (John). Ferns of Kentucky. i2mo. (1878.) 

 Fern Etchings. i2mo. (1879.) 



The literature relating to exotic species is very extensive 

 Some of the more important works are the following : 



Baker (J. G.). A summary of the new Ferns which have 

 been discovered or described since 1874. (1892.) 



Fee (F. L. A.). Memoires sur la Famille des Fougeres. 

 4to. (1844-1873.) 289 plates. 



Hooker (W. J.). Genera Filicum. 410. (1842.) 120 col- 

 ored plates. 



Species Filicum. 5 vols. 8vo. (i 846-1 864). 304 col- 

 ored plates. 



Hooker (W. J.) and Baker (J. G.). Synopsis Filicum. 2d 

 ed., 8vo. (1874.) Contains descriptions of all the ferns of the 

 world recognized at Kew to the date of publication. 



Hooker (W. J.) and Greville (R. K.). Icones Filicum. 

 2 vols, folio. (1831.) 240 colored plates. 



