FUN ARIA HYGROMETRICA. 103 



b. The hood, calyptra, that envelops and protects the 

 young sporophyte. Determine its relation to the 

 archegonium. 



c. Draw. 



3. The adult sporophyte. Observe: 



a. The elongated stalk, the seta. 



b. The enlarged tip, the capsule. 



c. The calyptra, frequently fallen away in Funaria; but it 

 may be found in some species at maturity. 



d. Draw, showing leafy shoot and complete sporophyte. 



e. The details of the structure of the capsule. By care- 

 fully cutting off and mounting the end of the capsule 

 observe: 



i. The operculum or lid, covering the mouth, and early 

 covered by the calyptra. 



ii. The peristome, fringing the mouth inside, composed 

 of projections, the teeth. Some mosses have two 

 and some one row of teeth. Observe the number 

 and arrangement of the teeth and the differences be- 

 tween the two rows, if present, 

 iii. Draw. 



iv. The spores, within the capsule. 



v. By means of prepared sections of young capsules, 

 both transverse and longitudinal, study the position 

 and extent of sporogenous and sterile tissues, the 

 stages in the development of spores, and the nature 

 of the teeth. 



vi. Draw. 



ANNOTATIONS. 



The gametophyte body of the moss is distinctly unlike 

 that of the liverworts studied. The asexual spores of 

 some of the liverworts in the earliest stages of germination 



