1895.] Aquatic Fungi. 435 
sphaerica from the fact that they mature their oospores within 
the oogonium. Although the development of these forms 
confirms in most respects the observations of Cornu, a brief 
account of their life history may not be superfluous. 
The hyphz of all the species of Monoblepharis are almost 
always recognizable at a glance from their elegant and charac- 
teristic vacuolation, the protoplasm forming a network of 
finely granular strands the meshes of which are often remark- 
ably regular in size and form, while in these strands the 
coarser granules may be seen moving with considerable rapid- 
ity. Thus in the smaller forms the strands commonly cross 
the filament nearly at right angles, and one seldom sees the 
more or less longitudinal arrangement of the granules so often 
characteristic of the Saprolegniacee. The fertile hyphe may 
arise in considerable numbers from a more or less well devel- 
oped creeping and branching base which is fixed to the sub- 
Stratum by terminal rhizoidal attachments, and in the two 
Species under consideration, which may be called M. zusiguzs 
and M. fasciculata respectively, are rigid in habit, tapering 
but slightly, rarely branched and without septa except in con- 
nection with the reproductive organs. According to Cornu 
the hyphe, unlike those of other Phycomycetes, give no test 
for cellulose; but the writer does not feel as yet fully satisfied 
with his own observations on this point. 
The antheridia in these species are invariably terminal or- 
gans, either at the tips of the main axes or of lateral out- 
growths from them, while the oogonia are always intercalary. 
In M. insignis, for example, a terminal more or less conical 
cell is separated by a septum to form the first antheridium 
(fig. 12). The portion of the hypha just below this septum 
then enlarges producing a lateral projection (the ‘‘neck” of 
the oogonium), the young oogonium thus formed separating 
itself by a second septum from the hypha belowit. The an- 
theridium thus appears to be borne directly upon the oogo- 
nium. In the species just mentioned, after the formation of 
the first oogonium, a lateral branch begins to form just below 
it (fig. 3), the tip of which is cut off as before to form a sec- 
ond antheridium, while its base and the upper part of the 
hypha below it enlarge together to form a new. oogonium from 
which a neck is laterally developed as before. The whole is 
then separated from the unmodified axis below by an addi- 
tional septum, so that as a result two oogonia are superposed 
