96 MOSS. 



c. Make a diagram of the section. 

 Under high power, examine in succession 



d. Each of the tissues enumerated. 



e. Draw a sector of the section. 



Make a transverse section of a mature capsule, notice 

 /. The thick walled, deep colored and strongly cuti- 



cularized epidermis. 

 g. The colored cells of the spore sac. 

 Make a longitudinal section of a nearly mature capsule 

 (after removing the calyptra), and with low power, notice 

 at the base of the capsule 



h. A mass of large thin walled cells forming the 



apophysis. 



i. Above the apophysis several layers of smaller, 

 more regular cells, from which arise the various 

 parts of the axial cylinder. 

 j. At the upper end of the capsule, notice 



i. The large central mass of wide thin walled 

 cells, resting upon the axial cylinder and 

 inclosed by the operculum. . 



ii. The line of separation between this and the 

 roof of the operculum, showing, more or less 

 clearly, the delicate membrane which is ex- 

 posed by the detachment of the operculum, 

 the epiphragm. 

 iii. The small deeply colored cells of the rim of 



the capsule. 



iv. The curved lines extending from the rim 

 to the edge of the epiphragm, the structure 

 usually not well shown, the teeth of the peri- 

 stome. 



v. The tissue of the operculum on the sides 

 where "it shuts over the teeth, of the roof 

 adjoining the epiphragm, and of the beak. 



