88 MOSS. 



a. The shape. 



b. The central disk. 



c. The leafy continuation of the stem arising from the 

 center of some of the heads. 



Cut a head in two vertically, and note 



d. The enlarged end of the stem, receptacle, on which 

 the disk is seated. 



e. Draw the half head, looking at the cut surface. 

 Remove the disk with the point of a scalpel, separate the 



parts on a slide, mount, and notice 



/. The broad chaff, resembling the scale leaves ; the 

 shape, especially the narrowed base. Draw. 



g. Numerous narrow bodies of nearly the same 

 length as the chaff, antheridia, the male reproduc- 

 tive bodies. 



h. Slender filaments of same length as the anther- 

 id ia, paraphyses. 

 2. The female heads. Make a vertical cut exactly 



through the center, and notice 



a. The absence of any thickening of the stem to 

 form an enlarged receptacle. 



b. The absence of a disk. 



Remove the central portion, separate well on a slide, 

 mount, and notice 



c. The numerous filaments, the paraphyses. 



d. A few bodies, not exceeding a half dozen, 3 about 

 as large as the antheridia, but swollen somewhat 

 near the base with the upper portion slender, the 

 archegonia, the female reproductive bodies. 



F. THE FRUIT. Notice 



8 The fewness of the archegonia, and the difficulty of securing them 

 at just the right stage of growth, often makes an extended search neces- 

 sary in order to demonstrate them. 



