268 



The spongy parenchyma consists of roundish, shortly branched 

 cells, which are placed more closely together, are elongated 

 and are even more shortly branched in the middle band which 

 is devoid of stomata. 



The hydathode is situated at the apex of the leaf upon the 

 upper surface; it does not secrete lime. The nerves are without 

 stereom and are surrounded by a hyaline bundle-sheath. 



Fig. 18. Saxifraga aizoides. 



The leaf: A, Upper epidermis. B. Lower epidermis. C, Upper surface. D, Lower surface. 



{A. B, C. D 2M/i). 



I have investigated specimens from Greenland (Ilua; Ivigtul, 

 Aug. 20, 1883) and Tromsø (1885); from all three localities 

 the specimens were similar in all respects. 



As already mentioned the plant lives both in very wet and 

 very dry localities. The specimens examined by me were not 

 accompanied by notes containing further information regarding 



