1904] JOHNSON—MONOCLEA IgI 
Soon after the separation of the antheridium mother-cell from the 
surrounding cells, it divides transversely into a terminal or body cell 
and a basal or stalk cell. The latter remains attached to the cells at 
the bottom of the pit, while the former is free from all but the stalk 
cell (figs. 6, 10,13). The body cell soon becomes remarkable because 
of its denser contents and its more active division. It first divides 
twice transversely, and thus gives rise to four primary cells in the 
body of the antheridium (figs. 6, 10). Meantime the stalk cell of the 
antheridium divides into two, the upper one of which usually remains 
undivided for some time, while the lower one soon divides by a trans- 
verse wall (figs. 11, 12, 13). There are thus usually seven tiers of 
cells in the antheridium at this stage. Of these the three basal ones 
are concerned with the formation of the stalk, while the four terminal 
ones give rise to the body of the antheridium (figs. 11, 12, 13). 
The stalk is more evident in the younger antheridium, since Wie: 
the older ones, though it is several cells broad, it is usually crushed 
down by the rapid elongation of the antheridium, which pushes 
upward against the roof of the antheridial cavity and downward upon 
the stalk (figs. Oo; 23). 
The first longitudinal wall in each of the four cells of the body of 
the antheridium is a diametric one (fig. 15). Each of the two cells 
So formed is then cut by a radial, longitudinal anticline, and thus 
quadrants are formed (fig. 16). The next wall appearing in each 
quadrant is a pericline, which cuts off an outer wall cell from an inner 
‘permatogenous one (jigs. 11, 13, 17). Next there appears in each 
ina radial anticline (fig. 17), and this is soon followed by other 
ri nee gR and some transverse anticlines, but no periclines are 
a aaa the wall cells except at the tip of the antheridium. Here 
tla ck A. group divide by one or two periclines, and thus give 
Dee fe ickened terminal area in the wall of the mature anthe- 
naa 85.9, 14). The rest of the wall of the mature antheridium 
wn throughout. The cells of the wall at maturity are 
eval a: ongated longitudinally to the antheridium and are about 
openi : — on all sides. The place and mechanism of the 
Th 7 the antheridium were not observed. 
ridium ‘Ant spermatogenous cell of each quadrant of the anthe- 
Up, at first in a pretty regular manner, by approximately . 
