60 



ON GENERA AXD SPECIES. 



under one specific name. For instance, under Pohjpoduim 

 lyeopodioides there are no less than twenty-two S3monyms, 

 and under P. brasiliensis eig-liteen. These examjjles are 

 additional proof of what lias already been said of the 

 confusion of the nomenclature of Ferns, brought about by 

 the different views of Pteridologists. 



I conclude this part by noticing a memoir, published in 

 1866, by J. E. Bommer, Secretary of the Royal Botanic 

 Society of Brussels, in the bulletin of the Royal Society of 

 Belgium, vol. 5, No. 3, 1866, entitled " Monographic de la 

 Classe des Fougeres," being a review of the writings on 

 Ferns by different authors, beginning with Bernhardi, 

 1799. He gives an abstract of the classification of the 

 principal authors, but as nothing specially new is brought 

 forward above what is noticed in the preceding pag-es, 

 it is not necessary to enter into details : he concludes 

 by giving an arrangement of his own which also presents 

 nothing new. 



The memoir is accompanied by six finely executed 

 plates ; the first shows the different forms of the sporangia 

 and synangia ; the other five plates contain portions of the 

 fronds, illustrating the character of forty-one genera. 



Abstract showing the number of genera of the preceding 

 authors : — 



Sprengel, " Systema Vegetabilium " (1827), 65. 



Presl, " Tentamen Pteridographire," and other works, 

 including Hymenophyllea 35, 230. 



J. Smith's Arrangement (18il), 143. 



Fee, Polypodiacese only (1852), 181. 



Moore's "Index Filicum " (1857), 178. 



Hooker's " Species Filicum" 5 vols. (1861), 66. 



Hooker's " Synopsis Filicum " (1874), ed. 2., 76. 



J. Smith, in the present work, 220, 



