из 



on account of the outer walls of the epidermis being so much 

 thickened. The cells of the spongy parenchyma below, and the 

 inner part of the guard-cells, are suberised along the part of 

 their walls which is towards the intercellular spaces. According 

 to LiDFORSs chlorophyll grains occur both in the upper and in 

 the lower epidermis. 



Fig. 26. Arctosta])hylos Uva-ursi. 



The leaf and its parts. Cf. note, p. 81. 1, x about 100; 3, 5, x about 125; 2, 4, x about ГэО. 

 (1,2,4, Finmark: Bosekop; 3, Norway: Tronfjæld; 5, Iceland.) (H.E.P.) 



The palisade and the spongy parenchyma are distinctly 

 differentiated, but the cells of the latter are in a great number 

 of cases elongated in the same direction as that of the former, 

 so that a kind of isolaterality is here found. 



The layers of palisade-cells vary in number, as do the 

 individual palisade-cells in regard to height. 



In specimens from Bosekop, Tronfjæld and Sakkabani the 



XXXVI. 8 



