GEOGEAPHICAl DISTRIBUTION. 383 



regions ; while Gampyloneuron, Pldehocluim, Goniophlebium, 

 and PolypodMin, are, with a few exceptions, natives of the 

 Western. 



It is very remarkable that genera with single species, 

 such as Matonia, Peranema, Loxoina, BictyoxipMum, and 

 Trichiocarpa are found only in very limited areas ; while, 

 on the other hand, two Ferns of special habit, DidymochlcEna 

 truncatula and Oleandra ncriiformis, are found in the tropical 

 regions of both hemispheres. The small Island of St. 

 Helena contains 25 species, of which 13 have been found 

 nowhere else. 



Besides the above conclusions arrived at by Mr. Baker, 

 another view of the number of species found in different 

 countries is derived from local " Floras " and " Catalogues," 

 of which the following are the principal ; it must, however, 

 be understood that many of the species found in one 

 country are also common to other countries : — 



Great Britain and Ireland, 36. 



Eurojie. Sadler and other authors, 67. 



Asia Minor and Syria, 25. All European. 



India. Wallich's MvS. Catalogue of the Plants of India, 

 475. 



India. Hooker and Thomson's Collection (J. Smith's 

 MS. List), 319. 



Ceylon. Thwaites' Flora, 214. 



Mauritius. Prof Boutan's List, 235. 



China and Japan, 118, 



Japan alone. A. Black's Enumeration, 82. 



Hong Kong. Benthem's Flora, 76. 



Java. Blume's Enumeration, 460. 



Philippine Islands. J. Smith's Enumeration, 297. 



Fiji. Flora Vitiensis Seemann's, 185. 



