104 .)//;/,'/> 7 '/:. V TISSl'E. 



cells corresponding to those observed under the previous prepara- 

 tion, and demonstrate the Tissue Forms in each. 



Drawings should be made sufficiently in detail to show the 

 character of the above-mentioned groups of cells in both trans- 

 and longitudinal section. 



DeBary, pp. 319-339, Strasburger, p. 107, Bessey, p. 117, 

 Vine's Text Book of Bot., pp. 174-182. 



Compare with closed collateral bundle of a monocot, (Fig. 

 19, 28.) 



Illustration B: From the stem of Cwm-hit 1'epo. 



PREPARATION FIRST: Radial longitudinal and transverse sec- 

 tions are to be prepared. 



ORSERVE: 1. The Fibro- Vascular Bundles: the smaller ones 

 opposite the external ridges of the stem; the larger alternating with 

 the smaller, and occupying the ridges projecting into the central 

 cavity of the stem. To the naked eye the bundles appear as ganglia 

 of smaller cells. 



2. The larger openings in the middle area of the larger bun- 

 dles, 3 to 8 in number. 



3. A group of smaller openings on the axial side of the larger 

 ones. This middle area is the xylem. 



4. Two nearly semi-circular or sometimes crescent-shaped 

 areas of tissue, one on the axial, and one on the peripheral, side 

 of the xylem. Both of these are masses of Phloem. Focusing 

 upon the larger openings of these areas, sieve-like plates may be 

 observed in some, forming septa. (Sachs' Text Book, p. 113.) 



5. Form of cells in other parts of the bundle. 



G. The thin-walled parenchyma, forming the greater part of 

 the stem and surrounding all the bundles. This is the tissue of 

 the Fundamental system. 



7. The Epidermis of the Stem. 



8. The "Intra- Corf '/<<! I A'/////": a band of several layers of 

 thick-walled cells, but faintly colored, and separated from the epi- 

 dermis by slightly stained cells. 



9. In the above-named slightly stained band note the sep;i 

 rated areas of Collenchyma cells. Bessey, p. 30. 



Collenchyma cells, as previously noted, are recognized by 

 the thickening of the walls at the angles. 



