458 Fr. J. Mathiesen, 



cortex is few-layered (5 — 7 layers), the cells in the 3 outer- 

 most layers unite closely without any intercellular spaces; 

 starch is found in the cortical cells. 



During the secondary growth of the root, the endodermal 

 cells are elongated tangentially, as are the othcr elements 

 of the cortex and, are divided as the exodermal cells, hy 

 thin radial walls, into 2 — 4 cells; moreover, in the inner 

 walls, and in the primary radial walls, there is formed a 

 cuticularised lamella (the thickly drawTi line in Fig. 35, A), 

 so that the stele becomes, so to speak, surrounded by a tube 

 of cuticularised material, only interrupted by non-cuticula- 

 rised passage-cells opposite to the protohadrome-rays; (the 

 roots investigated were 2 — 3 rayed). The secondary growth 

 of the root stops when a thin bundle of xylem-tissue, cir- 

 cular in outline, and surrounded by a narrow zone of sieve- 

 elements, is developed in the stele. 



The Peduncle presents nothing particular in its ana- 

 tomy. Chlorophyll-grains are found in the cortical cells, the 

 cells of the outer layer of the cortex have somewhat thickened 

 outer and inner walls; the endodermis has recognizable Cas- 

 parian dots. In the periphery of the xylem-ring the wood- 

 fibres dominate; the outer layer of the pith has thickened, 

 woody, porose cell-walls; the central cells of the pith are 

 thin-walled and die away. On the surface multicellular non- 

 glandular hairs occur. 



On the other hånd, the anatomicai structure of the run- 

 ner-like part of the shoots deserves a fuller treatment. A 

 diagrammatic transverse section is shown in Fig. 35, B; the 

 thickly drawn line slightly \\dthin the periphery indicates a 

 cork-layer, a portion of it is shown in Fig. 35, C under higher 

 magnification. The outermost (uppermost) layer of cells in 

 the latter figure, is the epidermis; this, together with the 

 2 — 3 outermost layers of the cortex, naturally dies away as' 



