338 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
trary to Berthold’s observations, both kinds of sporangium 
occur on the same plant. He further states that he 
obtained young plants from the mega-zoospores alone. 
Perhaps the most interesting point in Went’s paper is 
his discovery of the fact that the sporangium may, instead 
of developing zoospores, germinate itself directly into a 
new filament, branching even whilst still attached to the 
parent ‘‘palisade cell.” Went terms these ‘‘ abnormal 
sporangia,’ and suggests the possibility of their being galls 
due to the presence and stimulating action of Rotifera, just 
as the Rotifer Notommata produces galls in Vaucheria. 
He admits, however, that he saw no evidence for the 
presence of any parasite. 
Turning now to our own observations, we find that the 
sporangia are produced plentifully during the winter 
months, and are in the form of much elongated ovate 
bodies arising from the sides of the upper half of the 
‘‘palisade cells” (Pl. IIIL., figs. 15\-17> 183-2 isis 
5). Usually one sporangium is borne on-each “ palisade 
cell,’ but there may be a succession from the same cell, as 
is evidenced by the existence of scars indicating the points 
of attachment of older sporangia (Pl. IL., fig. 5, and Pl. IIf., 
fic. 18). In other cases two or even three sporangia may 
occur together (PIl..I1., fig. 5, and Pl. INL, fev 17 siieen 
sporangium as it ripens becomes separated from the parent 
palisade process by arn annular septum similar to those 
found in the vegetative part of the thallus. The wall of 
the sporangium is distinctly two layered, the outer layer 
being thin and well defined, the inner somewhat thicker 
and capable of swelling considerably. For the most part 
the two layers are in close approximation, but at the base 
and also at the apex they separate when the sporangium 
becomes mature. In fig. 15, Pl. III., a ripe sporangium is 
illustrated, where it will be seen that the inner wall is 
