fatees OVE DOIG ON Tf A.C HAE 15 
calary growth has been noted. The first division is of simple 
type, without a ring formation. The upper part of the cell 
is separated from the lower by a circular rent, but no new 
membrane develops between the two parts. As the new wall 
grows upward, the separated part is pushed to one side as a lid. 
The upper new cell grows out into a long tubular bristle with 
a swollen bulbous base. Subsequent divisions occur with the 
regular ring formation, and each new cell is intercalated between 
the basal cell and the next one above. The upper cell of each 
filament is therefore the oldest one. A lateral protrusion of 
each cell at its apex is cut off, developing into a hair. It is 
thus seen that the terminal cell bears two hairs, the other 
cells one each. Nearly every cell of Bulbochaete has two 
apical faces, one bearing a hair (or a cell of a side branch), 
the other the next upper cell of the main axis. Every cell of 
the principal axis of the filament, except the basal one, may 
cut off by an oblique division a lateral cell which becomes the 
basal cell for a side branch. By repeated divisions, first of the 
simple type and subsequent ones with ring formation, as noted 
above, this secondary basal cell (which of course is the primary 
basal cell of the side branch) forms the branch. Tertiary 
branches are formed similarly from the secondary ones, and so 
on through further branching. The mode of growth of the 
main axis is thus repeated by the side branches (See Plate X, 
figs. 93-99). 
The germination of a zoospore of Oedocladium is in many 
respects unlike that of either Oedogonium or Bulbochaete. 
The first cell formed upon germination develops into (1) the 
green filament with the rhizoidal cell forming as a branch; 
or (2) the rhizoidal filament with the chlorophyllose cell as a 
side branch; or (3) the green filament with the branch cell also 
green; or (4) a green filament without early branching. (Cf. 
Peete ne. 62 Pl Pooh, fie..623)-~ Théeformation of a 
branch in Oedocladium occurs by:the development of a circular 
rent in the upper extremity of a vegetative cell, forming an 
upper short ‘‘lid’”’ and a lower, much longer cylindrical piece. 
Through this rent the protoplasm of the forthcoming daughter 
branch cell with its initially thin wall protrudes. A new wall 
separating the branch cell from the cell of the main filament is 
then developed. This wall is attached to the juncture of the 
upper extremity of the cylindrical piece of the primary cell and 
the lower end of the branch cell, on the one hand, and to the 
