58 BOTANICAL GAZETTE [JANUARY 
March 26. Temporary sporangia of larger size. 
March 28. Many temporary sporangia emptied of zoospores. a 
March 30. Oldest temporary sporangia emptied a second time; second 
crop of temporary sporangia developing. oo 
April 1. Second crop of sporangia matured; third crop develop 
signs of resting sporangia. 
April 8. Several mature resting sporangia found. . 
Despite the luxuriant production of zoospores there are 
number of causes that may prevent their forming sporaugy 
In the first place, they seem to be in their fresh condition@ 
coveted prey for a number of the lower animals. _ In cell cultures 
amoebae were seen that had devoured eight or more. Ee 
some of the little heliozoa, scarcely larger than a zoospore, welt 
seen to catch as many as six before they became apparently 2 
isfied. But the most ravenous enemies were occasional rotifers, 
which did not seem satisfied with a capture of several hundre 
In the second place, the zoospores must reach their host a 
‘Settle down upon it. -Very likely many fail to do t 
Finally , after reaching the host there are those that never Su 
ceed in penetrating into the tissues. a 
_ The resemblance of the temporary sporangia to the f 
_ described by Zopf as Rhizophyton, on desmids and unicellt 
algae, Suggested the possibility of the temporary spor 
_ @eveloping on such hosts. In no case, however, where ge 
: nating resting Sporangia were placed with various specs 
algae and desmids, were there any indications that the z 
tried to penetrate them. a 
; The discovery of the temporary sporangia for this Cla 
_chytrium suggests. the possibility that other members re) 
rey soderma section of the genus may also have a similar : 
6 Through the kindness of Professor Thaxter the writer suct 
in obtaining leaves of Menyanthes trifoliata infected with 
Sonim Menyerntht Ties leaves had been ont 
= winter, and were badly rotted when obtained. The © 
‘sporangia, however, germinated rather | 
‘Water. This Cladochytrium ; 
the smaller, lighter-colored 
