60 ON GENERA AND SPECIES, 
under one specific name. For instance, under Polypodium 
lycopodioides there are no less than twenty-two synonyms, 
and under P. brasiliensis eighteen, These examples are 
additional proof of what has 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 “ Monographie de la 
Classe des Fougéres,” 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 pages, 
it is not necessary to enter into details: he concludes 
by giving an arrangement of his own which also presents | 
nothing new. Ce 
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. Ze 
_ Abstract showing the number of genera of the po | 
authors :— 3 
Sprengel, * Systema Vegetabilium " (1827 ), 65. 
Presl, “Tentamen Pteridographiæ,” and other works, ^ 
. including Hymenophyllea 35, 230, : 
_ J. Smith's Arrangement (1841), 143. 
. Fée, Polypodiacer only (1852), 181. 
Moore's * Index Filieum " (1857), 178. Ze 
Hooker's “ Species Filicum” 5 vols. (1864), erf | 
Hooker's “ Synopsis Filieum ” (1874), ed. 2 
H VR 
J. Smith, in the present work, 220. 
