452 



Fr. J. Mathiesen. 



Fig. 32, С shows а diagrammatic, longitudinal section of 

 that portion of the 3-year-old rhizome described above, in 

 which the boundary line between 2nd and 3rd year's growth 

 occurs — here, also, the thickly-drawn hues indicate the 

 cork-layers, and the xylem is shaded. As is evident from 



Fig. 33. Pedicularis Sceptrum caroUnum. 

 A, Transverse section of leaf. B, Palisade cells, and C, spongy paren- 

 chyma in surface view. D, Epidermal cells from the upper, and E 

 from the lower surface of the leaf. {A, В and С about ^^"/i; D and 



E about ^^7i-) (Aursundsöen,- Norway.) 



the figure the inner layer of cork is continued horizontally 

 in an inward direction, and forms a plate right across the 

 pith; the outer layer of cork shows various irregularities. 



A closer investigation of the process of development was 

 not possible, owing to the very scanty material; as regards 

 the development of a continuous layer of cork between the 

 growth-zones of the xylem, it must be noted, that a similar 



