[9] 



88 



FLOWERING PLANTS 



Herbaceous Stems (continued). 



E. From the stained section provided make a careful high-power drawing of a few cells of each of the following 

 tissues : (a) epidermis with cuticle ; (b) outer cortex consisting of thick-walled cells (collenchyma) ; (c) inner 

 parenchymatous cortex; (d) endodermis; (e) pericycle fibres; (/) phloem, including sieve-tubes, companion- 

 cells and parenchyma ; (g) cambium ; (h) xylem, including large (pitted) vessels, xylem fibres, parenchyma, 

 and (i) protoxylem ; (j) cells of the medullary rays which are beginning to form the interfascicular cambium. 



F. Examine the radial longitudinal section and draw under the high power a few cells of each of the following 

 tissues : (a) phloem shewing sieve-tubes and companion-cells ; (b) metaxylem shewing part of a pitted vessel, some 

 adjoining parenchyma and fibres, and (c) protoxylem shewing spiral vessels and adjoining thin-walled parenchyma. 



n 





