i6 



GENUS PALLAVICINIA 



The growing point of the shoot lies at the bottom of a more or less 



nt notch, formed by the active' growth of tin- ti-<ue on each side of 



the apical cell. The latter has segments cut off only from its two lateral 



faces. Seen in horizontal section (Fig. 8. C) it is a narrow triangle, with 



6 

 A 



Fig. 8. Pallavicina radiculosa. 



A. Cross-section of the thallus apex, showing the apical cell, x, and the apex, b, of 



a branch, a, a are the young scales subtending antheridia. 



B. The apex of the shoot, more highly magnified. 



C. Horizontal section of the shoot apex, showing the apical cell, x, and a very 



young antheridium. 



D. Vertical longitudinal section of the apex. 

 . Archegonial plant, x 3. 





