MORPHOLOGY 
FIGS. 77-79. Oedogonium: 77, portion of a fila- 
ment showing the large oogonium, which contains 
an egg filled with food reserve and a single nucleus; 
at the base of the oogonium a sperm is seen entering; 
also three antheridia, from two of which sperms have 
escaped; 78, 79, young filaments dereloping from a 
zoospore. After COULTER. 
terminal cells (anthe- 
ridia) develop sperms 
that are set free by the 
opening of the caplike 
lid (fig. 83). 
Bulbochaete. This well- 
known form has the same 
general life history as that 
described for Oedogonium, 
but it is a branching fila- 
mentous form. 
filaments, which may then 
be spoken of as male and 
female filaments. This 
separation of the sexes in 
different individuals is a 
condition called dioecism. 
Among these dioecious 
forms an interesting modi- 
fication may arise, the male 
filaments being very much 
dwarfed. These dwarf fila- 
ments are produced by 
special small zoospores, 
which are larger than the 
sperms but smaller than 
the regular zoospores, and 
are called androspores from 
their male product. These 
androspores swarm for a 
time and finally settle down 
upon female filaments or 
even upon oogonia, where 
they become anchored and 
each produces a filament 
of a few cells, whose small 
80 81 
Coleochaete This is FIGS. 80-82. Oedogonium: 80, contents of oosport 
, escaping from the heavy wall in germination; 81, four 
a most interesting and 20aspaKA forming in oospore; 82, the four zoospore* 
a very much discussed completed. After JUKANYI. 
