248 



1896), Mödrinellir (Iceland, May 19, 1889i, Upernivik (July 18, 

 188Ü), Danmarks (Aug. 1; 1892), Frederikshaab (June 8, 1888), 

 Malersomiarfik (July (5). Nova Zenibia and Tromsø (June 26, 



Fig. 4. Saxifraga rivularis. 

 A, Epidermis of the upper surface of the leaf. B, The 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 ^h). 



1886); therefore from Norway, Iceland, Nova Zembla, Green- 

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

 of the individuals they were all absolutely identical in regard 

 to leaf-anatomy. The specimens which have been investigated 



