MARCHANTIA POL YMORPHA. 1 1 



epidermal cells, in fresh specimens usually colored 

 purple or brown. Draw. 



c. The overlapping projections inclosing the right 

 and left channels or grooves, from the apex and 

 sides of which arise leaves, which seen in cross- 

 section appear as a single row of cells, or double 

 rowed at the base ; observe the manner of infold- 

 ing, comparing sections when convenient from 

 different parts of the same pedicel, and from 

 different pedicels, drawing the most interesting. 



J. In some of the grooves will be found excellent 

 cross-sections of the hairs. Examine now the hairs 

 pulled from the grooves. Draw. 



e. Remove a thin paring from the anterior surface of 



the pedicel, examine the epidermal cells, and, by 



varying the focus, the face of the leaves. Draw 



a few cells of each. 



2. The receptacle. Take a slice from the ridges on the 



upper surface of the receptacle, mount with the free 



surface uppermost, and notice 



a. The stomata and epidermal cells. 



/>. The flares, around which the epidermal cells con- 

 verge, the mouths to the underlying cavities con- 

 taining the antheridia. 



c. Draw. 



Remount the section with the free surface downward, 

 focus on the cut surface, and in the thicker part of the 

 section notice 



d. The large air cavities, producing from the sides 

 branched chlorophyll filaments like those of the 

 stem. Focus deeper into the cavities and notice 

 The stomata, the four innermost cells inflated and 

 almost or quite closing the pore of the stoma. 



/. The pores of the antheridial cavities situated in 



