338 Agricultural Experiment Station, Ithaca, N. Y. 



these erect conidiophores were bent in a prostrate position, and the 

 amount of moisture was sufficient to displace the greater amount of 

 air so that the medium between the glass and the agar was nearly 

 of the same density as the agar itself, and quite satisfactory photo- 

 graphs could be obtained when the subadjacent growth of myce- 

 lium was not too dense to interfere with the entrance of light, or to 

 produce a hopeless confusion of threads which were not desired. 

 Figs. 49, 51 and 54 represent some of the conditions of the coni- 

 diophores in this culture, which have been referred to above. (Figs. 

 46-51 and 54 were photographed at an ami^lilication of about 600 

 diameters.) 



A portion of one of the fruiting stools which was teased out from 

 a culture on vetch stems was photographed with an amplification of 

 100 diameters and is shown in Fig. 53, Plate VI, lower figure. 

 The preparation was mounted in water and the conidia which were 

 so numerous that they would have clouded the preparation were 

 mostly washed out. Quite a number, however, remained in the 

 preparation, and show as minute oblong dark spots over the field of 

 the photomiorograph. The fruiting stool is composed of numerous 

 branched sporophores closely compacted together. 



Caj^kee in Cucumbers. 



What is sometimes called canker in cucumbers has occurred dur- 

 ing the two past winters in the horticultural houses of Cornell 

 University. The appearance is that of a large and deep ulcer 

 in the stem at the surface of the ground. It occurs on plants of 

 considerable size, on stems from 5 cm. to 1 cm. or more in diameter,, 

 the vines of which are several meters long. The ulcer has a dull 

 brown color, the color of the external portion depending to some 

 extent on the amount of soil which becomes worked into it. The 

 tissues for some depth are soft and more or less putrid, dependent 

 on the stage of the disease. It may advance so far as to cause the 

 stem to rot off entirely, when, of course, the plant dies. In other 

 cases the plant may not be ultimately killed but the ulcer has af- 

 fected so deeply the vascular tissues as to interfere greatly with cer- 

 tain physiological functions of the plant. As the disease becomes- 

 serious the plants take on a sickly yellowish green color and be- 

 come more or less limp. It soon runs its course, ending in death. 

 During the month of December, 1894, sections of a diseased stem 

 were placed in water and kept as described above for the seedling 



