XIV 



INTRODUCTION. 



Asplenium Adiantum-nigrum. The remaining thirty-six I 

 retain, and have distinguished them by the letter R in the fol- 

 lowing list. 



In the ' English Flora,' Sir J. E. Smith adds nine spe- 

 cies : of these I omit four, — Aspidium spinulosum, Aspidium 

 dumetorum, Aspidium irriguum, and Cystopteris dentata, — 

 because they appear to me to have no claim whatever to be 

 mentioned even as varieties ; two, namely, Cystopteris regia 

 and Asjjlenium fontanum, because they have only been found 

 on garden-walls : and I retain three, — Polypodium calcareum, 

 Aspidium cristatum, and Asplenium alternifolium, — under 

 other names, and have distinguished them by the letter S in 

 the following list. 



In the ' Biitish Flora,' Sir William Hooker makes two ad- 

 ditions, — Aspidium rigidum and Hymenophylluixi Wilsoni, 

 — which, under other names, I retain, and distinguish by the 

 letter H in the following list. 



In the various editions of this work I have added nine other 

 species, and these are distinguished by the letter N. 



Alphabetical List of Species. 

 Aculeatum, R. t CoUinum, N. t Glandulosum, N. 



tAcutum, E. Crispus, R. 



Adiantum-nigrum, E. *Dickieana, N. 



Alpestre, N. 

 *Alpina, E. 

 tAngulare, R. 



Aquilina, R. 



Callipteris, S. 



Capillus-Veneris, R. 



Ceterach, E. 



Dryopteris, R. 

 Filix-mas, R. 

 Filix-femina, R. 

 Flexile, N. 

 Foenisecii, R. 

 Fragile, R. 

 tGermanicum, S. 



Ilvensis, R. 

 Lanceolatum, R. 

 Leptophylla, N. 

 Lonchitis, E. 

 Lunaria, R. 

 *Lusitanicum, N. 

 Marinum, R. 

 Montana, R. 

 Multiflorum, R. 



