444 Campbell. — The Gametophyte and Embryo of 
three in an antheridium of B. lunaria. It is very likely that more than one 
may also occur in B. simplex , but this was not the case in any of the 
specimens examined. 
The divisions in the inner cell of the young antheridium follow the 
usual sequence. The first two divisions are at right angles, forming four 
v equal cells, which later divide more or less irregularly until a large number 
Text-fig. 2. a. Median section of nearly ripe antheridium. x 300. b, c. Surface view 
of two antheridia showing the operculum, x 300. D. Median section of archegonium before 
the separation of the central and neck canal-cells. x 300. e. Young archegonium showing 
irregular division in the cap-cell. F. Archegonium in which the egg-cell, 0, is much compressed, and 
the lower part of the canal-cell, c, is enlarged so as to resemble an egg-cell. 
of polyhedral cells result — the spermatocytes. So far as could be deter- 
mined from a somewhat cursory study, the spermatogenesis does not differ 
from that of B . virginianum and Ophioglossum . 1 We may safely assume 
that the greater part of the spermatozoid is derived from the nucleus of 
the spermatocyte, while the anterior cilia-bearing portion arises from the 
blepharoplast. 
Of course it was not possible to examine living spermatozoids ; but 
1 Campbell, The Eusporangiatae. 
