30 GENUS PALLAVICINIA 



the capsule, which is elongated oval in outline, being about 4 mm. in 

 length by 1.5 nun. in breadth. The ripe oap.Mile opens by four longitudinal 

 slits, but the apical cap remains entire, so that the four valves between 

 the slits remain together at the apex (Fig. 20, B). The ripe spores 

 (Fig. 20, C) measure about 1411 in diameter, and the outer surface is 

 covered with closely set blunt papillae, with somewhat expanded outer 



Fig. 22. Pallavicinia Levieri. 



A-C. Young sporophytes. A and B still included within the calyptra; C, after 



breaking through. 

 D. Section of upper part of the capsule, highly magnified. 



