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 poröse. 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 В 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 В about ^^"/Г, С about 



11%; D and E about "%.) 



from the middle of the stem, is shown in Fig. 29, С 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, 6"), 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 



