130 TYPE STUDIES 



off from the leafy moss plant, or gametophyte, and mount 

 entire. Note and draw : 



1. The foot at the base of the sporophyte which was im- 

 bedded in the tissue of the gametophyte. 



2. The growing point at the tip of the sporophyte. The 

 sporophyte should be turned on the slide so that the 

 growing point Under h.p. shows the large, wedge-shaped 

 apical cell and the series of segments which are cut off 

 from it on either side. 



H. The adult sporophyte. In a habit sketch, if not previ- 

 ously drawn, show the relation of the sporophyte to the 

 gametophyte, its long stalk, and the spore case bearing the 

 calyptra like a cap at the end. Select a sporophyte in 

 which the spore case is still unopened and covered by the 

 calyptra. 



1. Eemove the calyptra and under a hand lens note the 

 cover, or operculum, over the cavity of the spore case and 

 the position of a ring, generally present just below the 

 cover.^ Draw. 



2. Pick off the cover and ring. Mount in water and draw. 

 Note the cell structure of the ring and its behavior 

 when wet. 



3. With a razor cut off the end of the sporophyte after 

 the cover has been removed and mount in water. A 

 circle of teeth is generally evident in the preparation, 

 all pointing inward in a regular arrangement. Under- 

 neath the teeth may frequently be found another circle 

 of delicate segments similar in form and arrangement to 

 the teeth. Count the teeth and segments. Show these 

 points in a figure. Note the spores in the spore case. 

 The circles of teeth and segments constitute the peristome. 

 If the teeth are not clearly shown, examine material as 

 described in 4. 



1 Species of Bryum are especially favorable for the study of the ring and 

 peristome (see Principles, Fig. 269). 



