ATRICHUM UNDULATi'M. 95 



J. Draw. 

 F. THE FRUIT. 



1. The seta. In a transverse section near the base, 



notice 

 a. The outer portion of thick walled, deeply colored 



tissue, passing abruptly into 

 /'. Loose, thin walled, colorless tissue. Within these 



and almost completely separated from them 



c. A core composed of the following tissues : 



i. An outer row of large, round, thin walled cells, 

 ii. Adjoining this a layer of smaller angular cells 



with walls somewhat thickened, and 

 iii. In the center, a few small cells with thin 



colorless walls. 



d. Draw a sector of the section. 



e. Notice the shape of the epidermal cells in a sur- 

 face slice. Draw. 



/. Examine several longitudinal sections, and deter- 

 mine as many of the tissues as possible. Draw. 



2. The capsule. Make a transverse section through the 

 middle of an immature capsule. Under low power, 

 notice 



a. Two parts, separated by a cavity : 



i. The outer, the wall of the capsule. 

 ii. The inner, the axial cylinder. 

 iii. Uniting these, if not torn away in making 

 the section, delicate radial filaments. 



b. The parts of the axial cylinder. 



i. The narrow outer part, the wall of the spore 



case. 



ii. The large central part, the columella. 

 iii. A dark line separating the two, the mother- 

 cells containing the young spores. 



