212 



Fr. J. Mathiesen. 



found. The epidermis is provided with stomates. Glandular 

 hairs occur on the peduncle as well as on the pedicels (here 

 particularly abundant), and on the calyx. 



The leaf (fig. 25). The epidermis on both surfaces 

 has undulating lateral walls. Stomates only occur on 

 the lower surface, and are fairly evenly distributed, an 



Fig. 25. Dodecatheon frigidum. 



A, the epidermis of tlie upper surface; to tiie left the underlying palisade cells are drawn 



■with dotted lines. B, the epidermis of the lower siu-face. C, transverse section of the leaf. 



D, a hydathode. {A, В and D, obj. 8, oc. 4; C, obj. 8, oc. 6.) (Herschell Island.) 



average about 55 per sq. mm. Glandular hairs, with 

 a unicellular, globular head on a 1- celled stalk, were 

 present on both surfaces. The hydathodes are charac- 

 teristic, each single water-pore (fig. 25, D) resting on a 

 small wart-like base; they are situated on the upper sur- 

 face of the leaf, near the margin and above the ends of 

 the veins. 



The transverse section (fig. 25, C) shows a single layer 



