248 



1896), Mödruvellir (Iceland, May 19, 1889), üpernivik (July 18, 

 1886), Danmarks (Aug. 1, 1892), Frederikshaab (June 8, 1888), 

 Malersomiarfik (July 6), Nova Zembla and Tromsø (June 26, 



Fig. 4. Saxifraga rivularis. 



A, Epidermis of the upper surface of the leaf. B, Tlie same (transverse section). C, Epi- 

 dermis of the lower surface of the leaf. D, The same. E. Spongy parenchyma. {A. B, 



C, D, and E 282,i). 



1885); therefore from Norway, Iceland, Nova Zembla, Green- 

 land and Jan Mayen. In spite of the widely separated localities 

 of the individuals they were all absolutely identical in regard 

 to leaf-anatomy. The specimens which have been investigated 



