TISSUE-SYSTEMS. Ill 



prosenchymatous cells, as in the wood of the. Akamatsu ; the 

 former kind is called the Bast Prosenchyma, and the latter 

 the Woody Prosenchyma. 



PbosenchymaI ^ *™-««^ 



{ Woody Prosenchyma. 



The vascular tissue may consist of soft vascular cells, as 



in the inner bark of Dicotyledonous Plants, or of hard 



vascular cells, as in the wood of common trees ; the former 



are called Bast Vessels, and the latter Woody Vessels or 



Trachea. 



-j-r ( Bast Vessels. 



VASCULAK TISSUE l w , „ ," 

 (Woody Vessels. 



As the bast vessels have thick transverse walls with numerous closely- 

 set perforations (sieve markings), they are also known as Sieve-vessels or 

 Sieve-tubes. These vessels are filled with protoplasmic contents, and the 

 woody vessels with air or water. 



There is another kind of vessels containing a milky or coloured fluid as 

 in the Tampopo ; they are called Laticiferous Vessels. 



All the kinds of tissues are represented in the following 

 table. 



j Soft Parenchyma. 



\ Hard Parenchyma. 



-r-j. I „ , ( Bast Prosenchyma. 



KINDS OP TISSUESJ Prosenchyma...] \ 



( Woody Prosenchyma. 



„ , ( Bast Vessels. 



Vascular tissue. ^ __ , _ _ . 

 ( Woody Vessels. 



Section 2. TISSUE-SYSTEMS. 

 The lowest multicellular plants are composed of uniform 

 tissues, but in the highest ones their bodies are composed 

 of different tissues which are regularly arranged in particu- 

 lar ways in each plant. Each aggregation of elementary 

 tissues forming a definite portion of the plant-body is called 

 a Tissue-system. 



