

MR 



ON THE GEOGRAPHICAL DISTRIBUTION OF FEHNS. 



89 



2 198. 

 2199. 



Marattia alata, Sm. . . . 

 Kaulfussii, J. Sm 



2200. Dansea simplicifolia, Rudge 



2201. 



trifoliata, Reich 

 trichomanoides, Spr 

 Leprieurii, Kunze . 

 humilis, Moore . . . 

 alata, Smith 



Augustii, Karst 



2203. 



2204. 



2205. — 

 -206. 



2207. 



2208. 



2209. 



2210. 



2211. Kaulfussia aesculifolia, JBl 



Moritziana, Presl 

 stenophylla, Kunze 

 elliptica, Smith . . 

 nodosa, Smith 



Suborder VI. OPHIOGLOSSACEJE. 



2212. Ophioglossum lusitanicum, L. 



2213. 

 2214. 

 2215. 



221& 



2217. 

 2218. 

 2219. 

 2220. 



rubellum, JVelw, 

 "bulbosum, Mich. 

 nudicaule, Kunze 

 vulgatuni, L. 

 reticulatum, L. 



intermedium, Hook. 



pendulum, L 

 palmatum, L 

 JBergianum, Schl. 



2222. Helminthostachys zeylanica, Hook 



222:]. Iiutni'liiiun simplex, Hitch 



2224. 

 2225. 



2226! 

 2227. 

 2228. 



rutaceum, Sw 



- Lunaria, Sw. 



- ternatum, Sw 



Torrid zone. 



South Temperate 



zone. 



Neath Tempen 





* 



Z"ll. 



10 

 10 

 10 

 10 

 10 

 10 

 10 



I 



10 

 10 



I 



10 

 10 



• • 



« • 



• • 



10 

 10 

 10 

 10 



• • 



• • 



10 



M 



t » 



- daucifolium, Wall 



virginicum, Sjo 



Total 



Species peculiar to the district 



Percentage of total number of species which are 

 peculiar 



• * 



« * 



10 



« • 



10 



H 



t t 

 ■ l 



9 

 9 

 9 



M 



9 



9 • 



W 



w 



8 

 8 



9 



• • 



I • 



• • 



9 



H 



M 



M 



• • 



f » 



7 

 7 



• • 



• • 



» • 



• • 



• • 



• t 



• • 



• • 



,. | 



• • 



• • 



7 



V ■ 



• • 



6 



• • 



C» 



A 



A 



I 



6 



Frigid 

 zone. 



■ • 





• - 



T 



6 



4 

 4 



4 



• 



5 



• - 



• • 



• • 



• • 



• • 



• • 







S 



W 



s 



s 





• • 



946 



863 



757 



80 



477 



346 



127 



118 



32 



55 



212 



74 



• • 



1 



4 



4 

 4 



C 



3 



a 







i 



2 



2 

 2 



114 





1 

 1 



2 



413 



22 



36 



— 



34 



37 



114 



14 



:!•> 



27 



81 





12 



26 



15 











Goin 



g through the districts one by 



one, I will next endeavour to point out the 



principal characteristics which their fern-floras present. 



1. Arctic Zone.-The Arctic region yields in all only 26 species, about one per cent 

 of the total number. Not one of them is peculiar to it, and no species can even be said 



to have its headquarters here 



The two ferns most preeminent! 



their 



Asplenium crenatum and Nephrodium frag ) 



and both are widely diffused 



the north temperate zone. Fifteen species 



habit Arctic America, all of which 



with one exception, are Arctic-European als 



confined to Europe. With one 



pti 



and, in the Arctic zone, the other ele 

 Nephrodium frogr 



all the Arctic 



ferns have a wide range 'in temperate Europe; and only two, the species which have just 



Of all the temperate regions, this has the smallest 



been mentioned, are not British 



2. Temperate Europe and Afi 

 fen-flora, and considerably the smallest number of peculiar species 

 of s ™w m*> u „^i^ *„ ci fmir ner cent, of the Order. I 



species which it yields is 81, four per 



Europe, which are-67 in number, we may divide them into four class* 



almost univer; 



°f these may be put at 



, " Vl luliUUiU ^' ' Aiffnml through central Europe 



ally, or at any rate widely, *™ *",_. thp omt 



The total number 

 Taking first, those of 



species 

 the number 



2nd 



pedes widely diffused through the centre of the 



