CALYCULARIA RADICULOSA CAMPBELL 



53 



three peripheral ones. From the axial cell is cut off the cover cell (Fig. 8, 

 B and C) and then follows a series of transverse walls separating the lower 

 part or venter from the upper region or the neck. From the lower of the 

 two primary axial cells the egg and ventral canal cells arise, and from the 



Fig. 8. A, apex of female plant, showing the 

 position of the archegonia, x about 40. B-E, 

 young archegonia in median section, x about 225. 



upper ones the series of neck canal cells and the outer cells of the neck. 

 The number of neck canal cells is variable, but to judge from the few that 

 were examined, there are first formed four of these neck cells, some or all of 

 which divide again, so that there may be as many as eight. The division, 

 however, is very often not complete but confined to the nucleus (Fig. 9, C 

 and D ) . As usual in the Jungermanniales, the neck of the archegonium has 

 but five peripheral rows of cells (Fig. 9, F). 



