156 Repokt of the Department of Botany of the 



prove to be the " Cellulinkdrner " of Prmgslieim.^^ According 

 to Pringsheim^i 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 wns 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 was a 

 mixture, chiefly of two kinds of fungi: (1) A fungus with large 

 hyphie 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 hyphie varied from 12 



Occasioually 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. A»i. Phil. Soc, 17(III):69], in speaking of cellulin grains, saj's: 

 " In L. lacteus they often become lodged in constrictions of the hyphii?." 

 He also cites Rothert's observation that they maj' disappear during the 

 formation of sporangia. Pringsheim's figures {Bcr. d. deutsch. hot. 

 GescUsch., 1, Taf. VII, Figs. 1-9) show the cellulin grains distributed seem- 

 ingly without reference to the constrictions. 



'"Priugshoim, X. Ueber Cellulinlv("»rner. eine Modification der Cellulose 

 in Kiiruerform. Ber. d. dcuisch. hot. Gcscllschaft, 1:288-308. Mit Taf el 

 VII. 



"Loc. cit. 



