Scrophulariaceae. 



443 



cortex is thin; in the xylem-ring the wood-fibres dominate 

 in the 3—4 outermost layers; the cell-layers in the periphery 

 of the pith are lignified, thickened and porose. On the epi- 

 dermis there are found non-glandular hairs of the same type 

 as on the leaves. 



The Leaf. A transverse section of one of the leaves 



Fig. 29. Pedicularis euphrasioides. 

 A, Epidermis of the upper, and B of the lower surface of the leaf. 

 C, Transverse section of the leaf. D and E, Non-glandular hairs from 

 the surface of the leaf. (Greenland.) [A and B about -^7i; C about 



"%; D and E about "7i-) 



from the middle of the stem, is shown in Fig. 29, C. There 

 is generally found only one layer of rather elongated pali- 

 sade-cells, below these there is usually a layer of cells which, 

 although elongated, are nevertheless branched (this is di- 

 stinctly seen to the left in Fig. 29, C), and which must there- 

 fore most naturally be included in the spongy parenchyma; 

 the lower layers of the latter consists of richly-branched cells. 

 The epidermal cells of the upper surface has thin, slightly 



