140 



Carsten Olsen. 



The upper as well as the under surface of the leaf is 

 provided with large two-armed hairs (Malpighia-hairs), fig. 3 A, 

 shaped like a pickaxe, the upper-surface having, on the same 

 area, about three times as many as the under surface ; they are 

 one-celled and the stalk is exceedingly short (fig. 4 A). The 



fuuL. 



Fig. 5. Cornus suecica. 

 Transverse section of stem; ph, Leptom ; had, Hadrome (Egedesminde, Greenland); about "•/,. 



surface of the hair (the short stalk excepted) has numerous 

 projections, thickenings of the walls, and the latter plainly 

 show several layers which are much thickened; the lumen 

 is extraordinarily small and seldom reaches the ends of the 

 arms, which are consequently solid (fig. 3, 4). 



The main veins of the leaves have on their under 



