Scrophulariaceae. 



449 



The Peduncle. A portion of a transverse section is 

 shown in Fig. 32, A. The layer of complete cells seen upper- 

 most in the figure, is the endodermis. The pericycle is several- 

 ay ered; sieve-tissue occurs rather sparsely. The vigorous 

 development of the stereom of the peduncle, is characteristic 



Fig. 32. Pedicularis Sceptrum carolinwn. 



A, Portion of a transverse section of peduncle. B, Transverse section, 



and С longitudinal section of the upper part of a rhizome; В and 



С diagrammatic, cf. text. (Aursundsöen, Norway.) [A about ^^°/l; 



В and С about «/i-) 



of the species. In the mass of wood-fibres only here and 

 there a radial row of vessels is inserted — in the figure the 

 4th row from the right hand is such a radial row. In between 

 the groups of the primarily formed vessels, of which one is 

 seen in the middle of the figure, the wood-fibres internally 

 adjoins the peripheral portion of the pith, which also consists 

 of strongly thickened, lignified and poröse cells, so that in 

 the fully developed stem the original groups of vessels are 



