BRYOPHYTES— MUSCI 



291 



material is collected. This will allow the fixing agent to penetrate 

 readily, and will also facilitate the infiltration of paraffin or celloidin. 

 The punctui-e causes only a slight damage, and need not reach the 

 really valuable portion which is to fur- 

 nish the median longitudinal sections. 



Fig. 89. — Funaria hygrometrica: bird's-eye view of the 

 peristome after tiie operculum has fallen off. X35. From 

 Chamberlain's Elements of Plant Science (McGraw-Hill 

 Book Co., New York). 



Fig. 90. — Sphagnum: longitudinal 

 section of sporophyte showing also the 

 upper portion of the pseudopodium and 

 the calyptra — Delafield's haematoxylin. 

 X24. 



The younger stages in the sporophyte of Sphagnum, like that shown 

 in Figure 90, and also the antheridia, archegonia, and the pecuUar 

 development of the leaves cut easily in paraffin. 





