PELLIA. 325 



ovoid cell-masses these usually have a single cell at each 

 end, while the middle part is divided by longitudinal as 

 well as transverse walls, the cells containing chloroplasts. 



(e) The outer capsule-wall layer, consisting in 

 surface view of polygonal cells with brown rod-like 



Fig. 73. PELLIA. A portion of the Capsule Wall, seen from within, showing the 

 fibrous bands on the inner layer of cells. 



thickenings on the vertical walls, chiefly at the corners 

 between adjacent cells. 



(/) The inner capsule- wall layer, consisting of 

 polygonal cells with numerous half-ring thickenings. 



463. Dehiscence Lines in Capsule- wall (Fig. 74). 

 With a razor cut off the upper half of a nearly ripe 

 capsule, and transfer it to a drop of water on a slide, with 

 the concave side upwards ; with a brush remove the spores 

 and elaters, then turn the piece over, flatten it under a 

 cover-glass, and examine the convex (outer) surface. 



Note the four dehiscence lines, marking out the 

 valves by which the wall would have split at dehiscence of 



