1026 Butler—On Allomyces, a new Aquatic Fungus . 
may last up to about half an hour, when the spores come to rest, still 
waving slowly their cilium, round off, the cilium disappears, and the spore 
surrounds itself with a wall. Germination is visible often within an hour 
of discharge, the germ-tube being single, slender, and branched. The 
zoospores are monoplanetic. I have made a most careful search for biciliate 
zoospores, the cilia being well fixed, and stained with iodine, and easy to 
see, and there is not the slightest doubt that in my cultures the spores were 
uniciliate. The point is necessary of emphasis on account of the importance 
sometimes attributed to this character, and also because of the observations 
made on Blastocladia , which appears to be a nearly allied genus. The 
latter has usually biciliate zoospores, but in some cases Thaxter, who has 
most closely studied it, failed to make out more than one cilium. Reinsch, 
who first observed it, did not describe the characters of the zoospores. 
The only other observer who appears to have encountered it is Petersen, 
who states that the zoospores are amoeboid and uniciliate. The remarkable 
triangular nucleus described by Thaxter in the zoospores of Blastocladia 
was not observed in the Indian Fungus. 
Besides sporangia a second type of reproductive body occurs which 
is of much interest. This is a sort of resting spore of distinctive shape 
and structure. It is formed invariably at the end of peripheral branches 
of the fertile hyphae, and appears later than the sporangia, though mature 
cultures bear both organs. The early stages of its formation are just as in 
the sporangium, the end of the hypha swelling up into a club-shaped body 
which is cut off by a septum. Within this the resting spore develops as 
a thick-walled, brown cell, truncate pear-shaped and with a sculptured wall. 
Frequently this cell fills the swollen end of the hypha so completely that 
the investing wall is merged in the exospore of the resting spore. In other 
cases a space is visible between them which is generally most distinct on 
the side of the septum, but is also often seen right round the spore. The 
resting spore is thus formed free within the terminal cell of the hypha, 
a character which removes it far from the category of conidia such as those 
of the Peronosporaceae. It is set free by the rupture of the enclosing 
membrane at a late stage in the life of the plant (Fig. 15) or, in those 
cases in which the membrane is closely applied to the exospore of the 
resting spore, by the abjunction of the whole upper segment of the hypha. 
The resting spore is yellowish brown when young, becoming a rich deep 
brown when mature. Its wall is composed of two layers, an outer, thick, 
brown and with distinct markings and an inner, thin, structureless and 
probably hyaline, though the latter character would only be determinable 
in an actual section which was not obtained. The structure of the exospore 
is exactly similar to that described by Thaxter for the resting spore of 
Blastocladia , and, as his description is full, need not be further referred to. 
In those cases where the wall of the containing cell of the spore is closely 
