MARCHANTIA POLYMORPHA. 69 



1. The border of triangular teeth ; the fimbriated sides 

 and elongated apex of each tooth. The inner part of 

 the cupule is too thick to be seen well. 



Place under a higher power. 



2. Examine the structure of the/^/Aand their marginal hairs 

 more carefully, and draw. Vary the focus, and notice 

 whether the inner surface of the cup is smooth or rough. 



Remove the cover-glass, turn the specimen over, and ex- 

 amine as before. Notice that 



3. The outer surface of the cup is covered with short hairs 

 vi papilla. 



Make a vertical section passing through the center of a 

 cupule and through the stem on which it is seated, examine 

 under low power, and note 



4. The two parts of the cupule. 



a. The base. 



b. The abruptly spreading limb. 



c. Arising from the bottom of the cup, flattened tri- 

 chomes, the genuine , in various stages of develop- 

 ment. 



d. Illustrate with diagram. 



Examine the limb under high power, noting 



5. The small cells of the inner epidermis, the parenchy- 

 matous tissue beneath, the absence of a distinctly 

 marked outer epidermis, and the short one- or two- 

 celled hairs on the outer surface. Draw. 



6. Examine next the base of the cupule, noting the man- 

 ner in which the layer of air cavities of the stem and 

 their chlorophyll tissue is continued up the outside of 

 the cup as far as the insertion of the limb. 



7. Upon the inside of the cup, observe 



a. The numerous glandular, one-celled hairs, and 

 among them 



