156 REPORT oF THE DEPARTMENT OF BoTANY OF THE 
prove to be the “ Cellulinkérner” of Pringsheim.” According 
to Pringsheim"™ they are not homogeneous in structure, but show 
Stratification. At first we did not notice this, but upon closer 
inspection it was found to be true. 
Before our study of the fungus was finished and before 
camera-lucida drawings had been made the fungus decayed and 
it was found impossible to obtain more of it. About October 7 
the drain became clogged and Mr. Hallock, thinking that prob- 
ably the fungus was the cause, applied copper sulphate as be- 
fore. But this time the remedy did not work and upon investi- 
gation it was found that rats had removed the wire screen from 
the upper end of the drain, thereby permitting the ingress of 
sticks and rubbish. When the obstruction was finally removed 
a small quantity of light brown fungus came away with it. 
While to the unaided eye this fungus bore some resemblance to 
the fungus which had clogged the drain in June, the microscope 
revealed the fact that it was quite a different thing. It wasa 
mixture, chiefly of two kinds of fungi: (1) A fungus with large 
hyphe bearing a striking resemblance to Rhizoctonia. They 
had a brownish tinge, usually branched at right angles, the 
branches somewhat constricted at the point of departure and 
with the first septum at a distance from the wall of the parent 
hypha. (Plate VI, Fig. 2.) However, the septa were not 
clearly defined and in many cases it was uncertain whether any 
real septa existed. The diameter of the hyphe varied from 12 
Occasionally a constriction was without a cellulin grain and sometimes 
cellulin grains were found elsewhere than at the constrictions; but, as 
a rule, there was a single cellulin grain at each constriction. However, 
it appears that this condition of affairs is not to be expected in all cases, 
and may, perhaps, be the exception rather than the rule. Humphrey 
[Trans. Am, Phil. Soc., 17 (I11):69], in speaking of cellulin grains, says: 
“In Lb. lacteus they often become lodged in constrictions of the hyphe.’’ 
He also cites Rothert’s observation that they may disappear during the 
formation of sporangia. Pringsheim’s figures (Ber. d. deutsch. bot. 
Geselisch., 1, Taf. VII, Figs. 1-9) show the cellulin grains distributed seem- 
ingly without reference to the constrictions. 
’Pringsheim, N. Ueber Cellulinkérner, eine Modification der Cellulose 
in Koérnerform. Ber. d. deutsch. bot. Gesellschaft, 1:288-308. Mit Tafel 
VIL. 
1TLoc. cit. 
