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. 

 iinalaschkensis^ 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, jp, H and /); 

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

 mentioned, in the floral region. 



Eiiphrasia aretiea Lange. 

 {Euphrasia latifolia (Pursh) Wettst.) 



Alcohol material from West and East Greenland (Fre- 

 drikshaab, leg. Rosenvinge, 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, 



