1906] SMITH—A NEW FUNGUS 219 
which a sterile culture of the fungus has been mixed, also become 
infected, 
Affected lemons placed on moist soil (as in nature by falling 
from the tree) produce a visible mycelium upon the surface and make 
such ground highly infectious to sound fruit laid upon the surface. 
In soil thus inoculated the characteristic spore stage of the fungus 
has been found. This is also readily produced on wet filter paper 
Fic. 3.—Stages in development of swarmspores from sporangia. 
in the bottom of a moist chamber containing an affected lemon. 
Upon an extremely delicate, fine, septate, branching mycelium, 
very numerous, terminal sporangia are produced (fig. 2), much as 
in Pythium under similar conditions. These sporangia differ, 
however, from’ those of the latter genus, in producing swarmspores 
by direct internal division, behaving in this respect like those of 
Phytophthora, which they also resemble in appearance (fig. 3). 
The appended description gives further details. These swarm- 
