74 ON THE WORLD-DISTRTBUTION OF THE BRITISH FERNS. 
Professor Babington has noticed tlie species in all the editions of 
his Manual as likely to be found native in Britain, and his expectations 
are thus realized. He distinguishes it as follows :— " Spur adpressed, 
more slender, ovate-oblong, blunt or emarginate; upper corolla-lip 
nearly three times as long as the subrotund palate ; peduncles four 
to five times as long as the bract, erect, with fruit ; leaves more dis- 
tant : bladders on both stems and leaves." 
ON THE WORLD-DISTRIBUTION OF THE BRITISH 
FERNS. 
By J. G. Baker, Esq., F.L.S. 
The following Table has been compiled for the purpose of showing 
at one view a general outline of the distribution throughout the world 
of the British Ferns. As regards nomenclature and species-limitation, 
I have followed the ■ Synopsis Filicum,' now in the press, commenced 
by Sir W. Hooker, of which one part was published before his death, 
and carried on by myself. I have not inserted a species for any dis- 
trict from which I have not myself seen a specimen. The districts 
adopted are as follows, viz. : 
Frigid Zone. 
1. Within the Arctic Circle, all round the world 
Temperate Zone. 
2. Temperate Europe and North Africa, including the Azores, Ma- 
deira, and Canaries. 
3. Temperate Asia. 
4. Temperate North America, exclusive of Mexico. 
5. Temperate South Africa. 
6. New Zealand and temperate Australia. 
7. Temperate South America. 
Torrid Zone. 
8. Tropical Africa. 
9. Tropical Asia and Polynesia. 
1 0. Tropical America, including the whole of Mexico and Brazil. 
