ve) BOTANICAL GAZETTE [JANUARY 
receptacle bearing an archegonium in which the cover cell has been 
formed, but no such condition was observed by the writer in the 
material used in this study. The initial arises as a superficial 
cell which becomes papillate, and the first transverse wall cuts off 
a basal cell from an outer cell (figs. 14, 15). Three vertical walls 
then appear in the outer cell, and the primary axial cell and primary 
wall cells are differ- 
entiated as in all of 
the Bryophytes (fig. 
16). The basal cell 
usually divides by a 
transverse (figs. 16, 
17) or vertical wall, 
but in no case was 
this division observed 
as taking place be- 
fore the appearance of 
the 3 vertical walls. 
STRASBURGER (10) 
has reported that in 
Marchantia the outer 
cell undergoes a trans- 
verse division before 
the coming in of the 
Fics. 14-17.—Fig. 14, archegonium initial, x 790; : 
fig. 15, appearance of transverse wall cutting off basal 3 VET tical walls, and 
cell from outer cell, X 790; fig. 16, division of basal cell JANCZEWSKI (5) has 
and differentiation of primary axial cell and primary foynd a similar sit- 
wall cells, 790; fig. 17, differentiation of cover cell 
and central cell, X 790 uation in Prevssta. 
These investigators 
may have mistaken an early division in the basal cell for one 
in the outer cell, as they show no mitotic figures which would 
prove the case. LertGes figures a young archegonium of Reboulia 
in which the 3 vertical walls have followed the transverse 
division of the archegonium initial, and DuRANnp observed the 
same condition in Marchantia polymorpha. Miss Starr’s figures 
also indicate that the early development of the archegonium of 
A ytonia is like that of Reboulia. , 
