1895.] Aquatic Fungi. 479 
sometimes seen in which the hypha grows on through and be- 
yond the empty sporangium eventually producing new spo- 
rangia at its top. The encystment of sporangia formed by 
proliferation within the empty primary sporangium has already 
been referred to and has been observed in a number of in- 
stances where the fungus was growing under unfavorable con- 
ditions surrounded by a mass of bacteria and other plants. 
The resemblance of such encysted sporangia to oospores is 
often misleading, but it must be admitted that the walls in 
such cases cannot be compared in thickness to mature spores 
_Reinsch in the paper already mentioned figures® a sporan- 
gium in which sporangiola are supposed to have developed 
from the walls of an empty sporangium, but as such a devel- 
opment is a manifest impossibility, it seems probable that the 
objects figured are rather zoospores which having been unable 
to escape have germinated in the position indicated. 
In several specimens of G. polymorpha oospores such as are 
represented in fig. 16, have been found associated with the 
zoosporic form, but in no instance was the material sufficiently 
good to show the hyphal connections of these spores. They 
are remarkable for their enormously thickened walls, and 
Neh Suare ead eel eaten ei eet a en 
® Cornu 1. c. 
"8. ¢., of. te. Ae 56 
