ON GENERA AND SPECIES. 49 



§ 3. Pilulariese (Gen. 1, Plhdariece, Lin.) 



§ 4. Marsileoa (Gen. 1, Marsilea, Lin.) 

 Tiie 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 seotioias, genera of extreme un- 

 natural habit and mode of growth as also difiering essen- 

 tially in their vascular structure, such as Jenkinsia and 

 Flatycerium ; Monogramma, Hymenolepis, and Oymnopteris ; 

 Lomofframma, Bryrnoglossum, and Tceniopsis ; Braiiica, Mi- 

 nisciuin, and Dryomenes ; Didymochlcena and MesocJdcena ; 

 Galymraodon,, Stegnogramma, Gymnogramma, StrutMopleris, 

 Jamesonia, and Drymaria ; Onoclea, Polysiichitm, and A^e- 

 phrolepis ; Cystopieris and Kumata ; and Woodsia and Ily- 

 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 Perns based upon these principles may be 

 viewed as analogous to the Linnean classification of phteno- 

 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,* 390 pages were published, and which 



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

 published. 

 E 



