PELLIA. 



323 



Fig. 71. PELLIA. Elongation of Seta due to growth in length of its cells. A, rest- 

 ing stage ; B, C, stages in elongation. In A, B, and C the entire Sporogonium 

 is shown diagrammatically on the left, and part of the Seta on the right, the 

 magnification being uniform in the three drawings. 



