Filices Adansonianae, 287 
work. I could see his specimens of Ferns by the courtesy of Prof, Lr- 
comre, and this is the first study of his specimens. 
| Dryopteris consists of 7 genera. The species are 
1. Asplenium sp.? (very small sterile one). 
. Athyrium alpestre? (sterile). 
3. Cystopteris montana. 
4. Leptogramme africanum. 
5. Dryopteris aemulina, D. Filix-mas, D. opposita, D. Oreopteris, 
D. Robertiana, D. spinulosa, D. Thelypteris, D. sp. ? from 
America, D. sp. ? from E. India. 
6. Nephrolepis longifolia. 
7. Polystichum aculeatum, P. Braun, P.lobatum, P. Lonchitis, 
P. varium. 
bo 
| By the modern classification his Dryopteris has most numerous species 
‚of Dryopteris (in CRRISTENSEN’s sense): «Lorsqu'un genre est divisé en deux 
ou plusieurs, le nom doit être conservé et il est donné à l’une des di- 
visions principales.» 
This is Article 45 of the rules of nomenclature, and Dryopteris com- 
‘promises with it. | 
Nephrodium is another name for the Ast group. The generic de- 
seription was at first given in Micuaux “Flora Boreali-Americana’ Tome II 
in 1803. It is as simple as Dryopteris. «Fructif. Puncta in disco frondis 
sparsa seu seriata, primum obtecta membranula reniformi aut lunata, hinc 
 (servato nexu laterali) dehiscente. » 
This apparently covers several genera, especially Dryopteris (mem- 
brana reniformi) Athyrium and Cheilanthes (lunata, servato nexu laterali). 
The specimens are in the Paris Museum; they are | 
Original (under Polypodium in Specimens) 
Nephrodium acrostichoides 
My view 
Polystichum acrostichoides 
> Thelypterordes Dryopteris noveborascens 
> marginale >» marginalis 
> punctilobulum Dennstaedtia punctiloba 
> bulbiferum Cystopteris bulbifera 
» Filix-foemina Athyrium Filix-foemina 
| Mix asplenioides > > 
> cristatum Dryopteris spinulosa 
> tenue Cystopteris fragilis 
> rufidulum Woodsia ilvensis 
> lanosum Cheilanthes lanosum 
» Dryopteris Dryopteris Linnaeana 
So Nephrodium Michaux comprises also 7 genera as Dryopteris of 
Apanson. The numbers of species are greater in Dryopteris, yet the re- 
19% 
