104 



Knud Jessen. 



often show large slit-like lacunæ on the dorsal side of the 

 leaf. Stereom is absent from the leaves. Fig. 39 {A,B,C, 

 D,E). 



At the apex of the leaf-teeth there is a slightly developed 

 epithema, below which tracheids terminate; water-stomata 

 occur upon the upper surface of the leaf-teeth on a limited area. 



The three bundles in the leaf-stalks of these two 



Fig. 39. 



Alchimilla alpina from Greenland. A, Transverse section of leaf (""/i). B, Stoma (-""/i). C, 

 Epidermis of the upper surface of the leaf ("°/i)- -D, Epidermis of the lower surface of the 

 leaf with hairs and stomata ('""/i)- E, Section of spongy parenchyma parallel to the surface 

 (-""/i). — Alchimilla fceroensis. F, Transverse section of leaf-stalk (-"/i) ; ch, collenehyma; e. 

 endodermis ; I, leptome ; x, xylem ; m, "pith". 



species are concentric in structure. This peculiar feature 

 was first demonstrated by G. de Candollei in a great many 

 Alchimilla-STpecies, among others also in A. alpina and A. 

 minor, and afterwards Bouygues^, without mentioning 

 de Candolle's paper, has published a short note upon the 

 same subject. Buser^ has been studying de Candolle's 



1 Bull, de l'herbier Boissier, T. I, 1893. 

 " Act. soc. Linn. de Bordeaux, 1900. 

 8 Bull, de l'herbier Boissier, T. II, 1894. 



