APPENDIX 



TO 



THE PHYTOLOGIST 



For 1851. 



Art. I. — Synoptical Table of the British Ferns. 

 By Edward Newman. 



Ohs. — This is confessedly but a crude attempt to arrange our ferns in 

 accordance with their natural aflanities. After maturely consideiing the 

 associations upon which heretofore so much stress has been laid, I have ar- 

 rived at the conclusion that they are unsatisfactory; and yet, in abandoning 

 such divisions as Polypodium of the Linnean school ; as Aspidium, so ear- 

 nestly advocated by Smith and Hooker in this country, and equally great 

 names on the Continent ; and as the more recent combmation called Las- 

 trea by Presl and John Smith, and formerly adopted by myself; I feel as 

 one groping his way in the dark, and shall eagerly avail myself of any 

 friendly hand that may be held out to support and direct my tottering and 

 uncertain footsteps. 



Vegetables are divided by botanists into four primary groups, 

 one of which, called Exogens, is single, and the others, seve- 

 rally called Endogens, Acrogens, and Thallogens, are double ; 

 that is, each of them contains two groups, which, in intimate 

 structure, are alike, but in certain less important characters 

 differ. 



Acrogens are either Filicoid, or ferns and their allies ; or 

 Muscoid, or mosses and their alKes. 



Filicoid Acrogens are divided into seven secondary groups, 

 called Orders ; which however consist of a single one and tliree 

 pairs : so that the divisions of the secondary, are in fact nume- 

 rically identical with those of primary gi-oups. 



APPENDIX IV. A 



