490 



Fr. J. Mathiesen. 



"boggy piaces in mountainous districts, .... from the birch- 

 zone up to the Hchen-zone; more rare below the pine- 

 limdt"; Th. Resvoll has now and then observed it in 

 snow-troughs ; it is, however, no typical snow-trough-plant. 

 It does not ascend very high in the Alps; Schroter (p. 255) 

 mentions it as occurring in the transition-zone between his 



Agrostidetum-trifolietum and 

 Curvuletum {Carex-curviila- 

 assoc). In Arctic Eastern Asia 

 Kjellman foimd it growing 

 on damp coastal plains. 



Anatomy. In anatomicai 



respects the root very much 



resembles that of P. hirsuta, 



the radiating cleft-formation 



in the stele — at any rate in 



the adventitious roots, which 



are the only ones that have 



been investigated — is not, 



however, so decided as in P. 



hirsuta. 



The epidermis decays early; during grov*i,h the cells of 



the cortex are greatly elongated in a tangential direction, 



and undergo divisions by thin radial walls. The portion 



figured in Fig. 45, A is taken from a transverse section of 



an adventitious root, 6 mm thick ; the endodermal region lies 



at a depth of only 3 — 5 cell-layers; the Casparian dots are 



still recognizable here and there in the endodermis, the cells 



of which, as those of the primary cortex, are seen to be 



very greatly elongated in a tangential direction, and to have 



undergone secondary division. In the secondarily formed 



cortex the parenchyma predominates over the sieve-tissue. 



In all the parenchymatous cells of the root and meso- 



Fig. 45. Pedicularis Oederi. 



A, Transverse section of the 

 peripheral layers of the root. 



B, Section through a leaf-scar. 

 [A about '»/i; B about i^/i.) 



