40 GENUS I'AI I \viciNIA 



7. Of the three species examined, P. Zoi. hafl tlu- 



^onial receptacle, and P. radiculosa the largest. The archegoninm 

 of P. radiculosa shows a limited apical growth due to the activity of the 

 cover-cells 



8. The embryo of Pallavicinia agrees in many ways with that of 

 other Anncn^viKu- that have been Muiu'l. It is pcrh.ii.x , n ,,, t like that 

 of Ancura in the development of a very large haustaurial organ, or sus- 

 pensor. In this respect the species under con <>n seem to differ 

 a good deal from P. decifiiens. and from Morkia. Of the three species, 

 P. Zollin^cri is nearest to Morkia in the form of the capsule and the larger 

 foot. 



9. The species all agree in the structure of the capsule, which has 

 a more or less conspicuous terminal beak or pad, which remains intact, 

 so that the four valves of the open sporogonium remain attached to 

 other at the apex, and the capsule opens by four longitudinal slits. The 

 beak is best developed in P. radiculosa, which has a much more elongated 

 capsule than the other species. In its much shorter and relatively broader 

 capsule, P. Z0//fV iore like Morkia or Calycularia. P. Zollin^cri 

 is also like the latter in the tuberculate spores. In P. radiculosa and P. 

 Levieri the spores are reticulately marked. 





