22 



GENUS PALLAVICINIA 



the four original peripheral cells of tin* antlK'ridium have each divided at 

 least once (Fig. 10, G). The first d -i the central cells is a transverse 



one, quickly followed by a vertical division, so that whether in longitudi- 

 nal- or cross-section, the central cells are arranged quadrant-wise < 

 10, H, II, B). The subsequent divisions follow rapidly, hut without any 



Fig. ii. 



A-D. P. radiculosa; E-G, P. Levieri. 



A-C. Cross-section of young antheridia. 



D. Longitudinal section of a nearly ripe antheridium. 



E-G. Longitudinal sections; //, transverse section. 



