LATICIFEROUS SYSTEM. 



125 



distribution, they are likely to be much more numerous than 

 in the radial section. The facts thus made out exactly tally with 

 those just detailed, and serve to supplement them. 



Laticiferous Netivork. Anastomosing latex-vessels, in 

 which the latex system is 

 converted into a whole, 

 by means either of the 

 perforation of connecting 

 cells, or the putting forth 

 of lateral anastomosing 

 protuberances, can, how- 

 ever, be found in the 

 Poppies (Papaveracece), 

 the Bell worts (Campanu- 

 lacea), and in the liguli- 

 noral section of the Com- 

 posites (C ichor iacece), as, 

 e.g., in the Dandelion. 

 Of these we can select 

 as an example the garden 

 Scorzonera (S. hispanica), 

 not infrequently grown in 

 kitchen gardens for its 

 parsnip-like roots. Tan- 

 gential sections, taken from 

 the external part of the 

 root, a short distance be- 

 low the -exterior, if treated 

 as described above, will 

 sho\v in the bast portion 

 of the vascular bundles 

 an extensive network of 

 latex-vessels, filled with 

 their very granular con- 

 tents, shown in Fig. 46. 

 A somewhat similar net- 

 work, though not so clearly displayed, is shown in the root of the 

 Dandelion, by means of tangential sections, which are best cleared 

 by treatment with potash. 



Latex-cells of Euphorbia. In the Euphorbiaceae, and a few 

 other plant groups, the latex is found in enormously elongated 



FIG. 46. Latex^vessels iu the bast of Sarrzonera 

 hispanica, tangential section. B, a portion of A , 

 more highly magnified. (After Sachs.) 



