ON GENERA AND SPECIES. 49 



3. Pilularieao (Gen. 1, Pilulariece, Lin.) 

 4. Marsileee (Gen. 1, Marsilea, Lin.) 



The above classification shows that Mr. Moore has be- 

 stowed great ingenuity upon its formation, but I cannot 

 view it otherwise than as an artificial arrangement founded 

 upon certain technical data that normally characterise all 

 true Ferns, whatever size, habit, or mode of growth they 

 assume. We need not therefore be surprised at finding, 

 associated under the same sections, genera of extreme un- 

 natural habit and mode of growth as also differing essen- 

 tially in their vascular structure, such as Jenkinsia and 

 Platycerium ; Afonogramma, Hymenolepis, and Gymnopteris ; 

 Lomogramma, Drymoglossum, and Tceniopsis ; Brainea, Mi- 

 niscium, and Dryomenes ; DidymocJilcena and MesocJilcena ; 

 Calymmodon, Stegnogramma, Gymnogramma, StrutJiiopteris, 

 Jamesonia, and Drymaria ; Onoclea, Polystichum, and Ne- 

 phrolepis ; Cystopleris and Humata ; and Woodsia and Hy- 

 poderris : the placing of these in their respective sections 

 being entirely guided by the character of the fructification, 

 without regard to natural habit. Any system of classifi- 

 cation of Ferns based upon these principles may be 

 viewed as analogous to the Linnean classification of phaeno- 

 gamous plants. 



I have now to notice the next part of this work, 

 which consists of an alphabetical arrangement of the 

 whole nomenclature of Ferns, collated from the publica- 

 tions accessible to the author, "and blended with such 

 personal information as the author has been able to bring to 

 bear upon the subject." In order to appreciate the extent 

 of this work, it is only necessary to state that up to Sep- 

 tember, 1862,* 39G pages were published, and which 



* Up to the present time, 1874, no addition to the above has been 

 published. 



