68 BOTANICAL GAZETTE [JANUARY 
spermatogenous tissue is like that of the other Marchantiales. 
The sperms differ in no way from those of the other members of 
the group. 
12 
Fics. 9-12.—Older antheridia: fig. 9, vertical walls appearing in middle tiers, 
790; fig. 10, complete development of vertical walls and appearance of transverse 
walls below, 790; figs. 11, 12, appearance of periclinal walls, «790. 
With the coming in of the first vertical walls in the young 
antheridium, several mucilage hairs arise from the cells which 
line the antheridial cavity. These arise near the base of the 
