38 Wisconsin Academy of Sciences, Arts, and Letters. 
showing both extremes in number. The nuclei are slightly 
smaller than those in the young germ tube but show the same 
general structure, a definite membrane and a nucleole which ap¬ 
pears separated from the finely granular chromatin by a small 
clear space. In some of the preparations the nuclei were drawn 
out into long rather slender bodies with larger and very irreg¬ 
ular chromatin granules loosely scattered throughout their 
length. 
Special lateral branches may also be formed which have reg¬ 
ularly uninucleated cells. These branches vary considerably in 
length and general shape. Some are long and nearly straight, 
or only slightly coiled, with long slender cells. The nucleus 
lies near the center of the cell and has the structure described 
above. Towards the ends of these branches very short cells are 
formed, only about twice as long as broad. These cells separate 
readily thus forming oidia. The character of the cytoplasm in 
these oidial cells is the same as that of the branch from which 
they originate. It is sometimes dense with very small vacuoles 
similar to that found in the spore. In other cases it has much 
larger vacuoles and the cytoplasmic granules as much larger 
and more irregular. In the majority of cases the nucleus is 
relatively large occupying nearly the entire diameter of the 
cell. In some instances the nuclear membrane and nucleole 
could not be distinguished and the chromatin was collected in 
two or four deeply staining masses usually oblong in shape. 
These nuclei may have been in some stage of division. 
In one instance a slide culture that was placed in a very warm 
moist chamber (22° c.) showed a pronounced modification in 
the usual habit of growth. In many cases the germ tube was 
divided at once into uninucleated cells that bore numerous short 
series of oidia. The branches were coiled about the tube mak¬ 
ing it impossible to determine their number or structure. In 
other cases the hyphae were much longer and very slender with 
two or three branches on whose ends were large tangled masses 
of oidia. The oidia were rather slender and long but showed 
the usual structure. 
Carpophores were not formed in any of the cultures but my 
studies on Ilypholoma perplexum were continued on material 
