258 EEVIEW ON TISSUES 



tous tissue already described. The fibro - vascular system 

 may be said to be imbedded in the fundamental tissue. 

 (3) Epidermal tissue system. This is the covering of 

 the other systems, and is composed of epidermal tissue, 

 already described. It should be borne in mind that the 

 types of cells and tissues as denned in this chapter are 

 not all that may be found in plants. There are many inter- 

 mediate forms, e. g., tracheids and ducts blend the one into 

 the other; and the same is true of wood cells and tracheids, 

 419. Summary of tissues studied: 



1. Parenchymatous tissue. 



a. meristematic. 

 6. permanent. 



2. Epidermal tissue. 



3. Collenchymatous tissue. 



4. Soft bast or phloem (sieve tissue). 



5. Prosenchymatous tissue. 



a. Fibrous tissue or bast fibers. 

 I). Wood tissue or wood fibers. 



c. Tracheids. 



d. Vascular tissue or ducts. 



6. Sclerenchymatous or sclerotic tissue. 

 '7. Laticiferous tissue. 



8. Tissue systems. 



REVIEW. What is a tissue? How may two tissues differ? What 

 is parenchymatous tissue? Name three places where this is found. 

 Distinguish between meristematic and permanent tissue. Name two 

 uses of parenchymatous tissue. Of what use are the intercellular 

 spaces of leaves? Describe the parts studied in the section of root 

 tip. What part of this tip will become vascular? Describe epidermal 

 tissue. Collenchyma. Sieve tissue. Of what use are the sieve areas? 

 What are the chief uses of prosenchyma? Describe fibrous tissue, 

 wood cells or wood fibers; tracheids; ducts. What does your ex- 

 periment in blowing air through a grapevine stem indicate? De- 

 scribe cells of sclerotic tissue. Laticiferous tissue. Name three tissue 

 systems. What are fibro -vascular bundles? What two classes of 

 tissue are found in each bundle ? Of what is phloem composed ? 

 Xylem. 



