398 Fr. J. Mathiesen. 



of the outer walls is but slightly developed. Stomata occur 

 in almost equal number on both sides of the leaf; the guard- 

 cells are surrounded by 4 — 5 cells, and are on a level with,, 

 or slightly raised above, the surface of the lamina — on 

 the large subtending leaves of the flowers I found them 

 sometimes raised high above the surface. 



The leaves are densely covered with hairs; the following 

 types of hair occur: (1) Non-glandular, thin-walled, pointed 

 and with fine cuticular striations; they may either be short 

 (1 — 2 celled) or long (multicellular) and even elongated like 

 a whip, the last-mentioned are numerous especially in var. 

 unalaschkensis, and particularly in the top of the shoots. 



(2) Glandular hairs with multicellular stalk, and with 1 — 2 

 celled head; the basal cell has sometimes cuticular striations. 



(3) Glandular hairs with unicellular, quite short stalk and 

 2-celled head (in Fig. 13, G such a hair is seen in lateral view^ 

 highly magnified; in H and / they are seen from above), 

 in the cells of the head and the stalk comparatively large 

 nuclei occur, and a highly granular protoplasm. These various 

 forms of hair occur intermixed (cf. Fig. 13, F, H and /); 

 they are also found on the surface of the stem and, as already 

 mentioned, in the floral region. 



Euphrasia aretiea Lange. 



(Euphrasia latifolia (Pursh) Wettst.) 



Alcohol material from West and East Greenland (Fre- 



drikshaab, leg. Rosen vinge, 15. 8. 1886; Sydproven; Hekla 



Havn, leg. N. Hartz, 13. 8; Unartok and Tasiusak). 



Herbarium material from West and East Greenland, the 



shore of Hudson Bay, Northern Norway, Lapponia murman. 



Lit.: Lange, 1880, p. 79; 1887, p. 264; Warming, 1886, pp. VII 

 and 43; 1888, pp. 34 and 59; 1890, p. 226; Rosenvinge, 1892, p. 687; 

 1895 (I), p. 68; 1895 (II), pp. 162, 168, 219 and 245; Hartz, 1894, 



