THE OTHER BRITISH FERNS 



C. Baenitzii Dorfl. in Norway, north Sweden and Finland and quotations of records in 

 the flora of Russia (Komarov, 1934) from right across Siberia. From the south there 

 are specimens in the Kew herbarium from Algeria, Asia Minor, Persia and the 

 Himalayas. They also seem to be present in North America. 



t* 







4 *• '^ J 



c d 



Fig. 120. Meiosis in various QvJ'to/^/mj types, acetocarmine. x 1000. a. 'C./ra^//w' from Ingleborough, 

 Yorkshire. «=I26. b. 'C. alpina forma obtiisa Kestner' from Switzerland, from the leaf of 

 Fig. Ilia, n = 1 26. For explanatory diagram see Fig. 1 2 1 6. c. ' C fragilis ' from Canada from the 

 leaf of Fig. 119c. 72 = 84. For explanatory diagram see Fig. 121a. d. C. montana (Lam.) Desv. 

 « = 84. For explanatory diagram see Fig. 122. 



With such a vast range to explore a precipitate definition of species would be unwise. 

 In terms of populations, however, we seem to be dealing with an ancient and perhaps 

 relict stock of arctic affinities which is probably not co-specific with the spiny-spored 

 Cystopteris, though whether it represents one species or several cannot yet be known. 



120 



