HISTOLOGY OF ANGIOSPERM STEM, ROOT, ETC. 



95 



minutes, then mount them in water and press on the cover- 

 glass. See " Maceration " in Appendix. 



104. Sunflower Stem (Figs. 25, 26). Cut transverse 

 and radial longitudinal sections of a well- grown stem 



INTERFASC. CAMBIUM -. 

 MED. RAY 

 TISSU 



StfFT 



BAST / ENDODERMIS 

 / \ HARD BAST 



SIEVE TUBES 



Fig. 26. Transverse (upper) and Longitudinal (lower) Sections of Part of a 

 Sunflower Stein. 



(about 1 cm. diameter). Note that (1) the central ground 

 tissue (pith) does not become torn to form a cavity, but 

 remains solid ; (2) the vascular bundles are arranged in 

 a single uniform ring ; (3) below the epidermis there is a 



