1895-] Aquatic Fungi. 439 
demonstrate the characteristic processes of reproduction. It 
varies considerably in the size of its filaments, as well as in 
the size and form of its oogonia and oospores, the latter often 
following the contour of irregular oogonia in which they may 
have been formed. 
p lata, nov. sp. —Hyphe straight, rigid, 
cylindrical, simple or rarely branched except at the tips, 
1-2™ long by 6# in diameter. Antheridia narrow, tapering 
slightly, straight, not divergent. Antherozoids about sixteen 
in an antheridium, 3 in diameter. Oogonia evenly oval ob- 
long or elliptical, the neck small and prominent, usually shorter 
than the antheridium which is always present, single and ter- 
minal or borne superposed on short crowded branches from 
the tips of the fertile hyphae. Oospores more or less regu- 
larly oval oblong or elliptical, smooth, pale amber-brown, 
maturing within the oogonium, 22x 184. Zoosporangia lik e 
the oogonia, bearing antheridia: the zoospores 2-ciliate, about 
5-6 in diameter. 
On submerged sticks with the last. Weston and Medford, 
Mass. 
This species, which seems to be much more rare than the 
preceding, has been found but twice in the localities men- 
tioned. It seems to be abundantly distinguished from the 
last by its constantly smaller size and the greater regularity 
and different form of its sexual organs and spores, as well as 
by its fasciculate habit. 
Harvard University. 
EXPLANATION OF PLATE XXIX. 
Monoblepharts insignis Thaxter. 
Fig. 1. Group of fertile hyphe bearing oogonia terminally. a, 
eh ng from the tip of which an antheridium has been cut off. 
ig. 2. Oogonium and antheridium neither of which have yet opened. 
A new oogonium beginning to form below the first. , 
An oogonium still closed, over which two antherozoids from 
Sy 
e same ten minutes later; the oogonium Just opened and 
its tip; the coarsely 
