430 Agricultural Experiment Station, Ithaca, N. Y. 



Ou potato a dense white and cottony growth ap])ears, and soon 

 spreads over the surface. A yellowish buff tinge is noticeable very 

 early. A bright greenish lemon-yellow is noticeable where the 

 mycelium comes in contact with the glass. Sporophores soon 

 appear rising from the sides and upper portions of the potato 

 slab. In one case a sporophore 5 mm. in diameter grew from the 

 side of the potato to a height of 4 cm. in a nearly vertical direction 

 (Figs. 99 and 100). At this distance from the base, it divided into 

 15 smaller branches, some of them 2^ cm. in length and from 1-^ to 

 2? mm. in diameter. All of these branches are covered with a 

 dense, farinaceous yellowish-white coat composed of colorless 

 conidia. Sometimes clavate branches are produced from 2 to 3|- 

 mm. in diameter. Usually, however, the branches cling to the glass 

 quite closely and are simple. A culture in an Ehrlmeyer-flask, having 

 pieces of potato on the bottom to the depth of half an inch, grew 

 much as in the case of a potato culture in a tube, except that the 

 sporophores were in general larger and much more flattened and 

 clavate, owing to the increased supply of food and air. Some of 

 them were 2^ cm. long and over 1 cm. broad at the apex. They 

 were about 4 mm. thick. The bases of the sporophores were tinged 

 with lemon-yellow. 



Several specimens of our common brown and black caterpillar, 

 PyrrKarctia isahella, were dusted with conidia of this fungus and 

 some of the caterpillars died. Two produced many yellowish, 

 sporophores from 2 to 3 mm. in length, in color closely resembling^ 

 the original specimens. Unfortunately I have not been able to 

 obtain a pure culture of any Isaria-like form from the specimens 

 showing the sporophores. Specimens placed under like conditions, but 

 not dusted, died, but did not show any signs of the fungus. The cause 

 of the death of those exhibiting the fungus is, therefore uncertain. 



COEDYCEPS MELOLONTHAE (?) (Tul.) Sacc. 



Conidial stage {?). — On October 15, 1895, Mr. Pieters found a 

 white grub, tlie larva of Lachnosterna, lying on the surface of the 

 ground in one of the forcing-houses. It was covered with short, 

 stout sporophores, both simple and branched, the one near the anus 

 being fully 5 mm. long. A growth 6 mm. in length, bearing 

 several short, spindle-shaped branches, issued from near the head. 

 The grub was placed in damp sphagnum, to allow the development 

 to proceed still further. After about two weeks the sporophores 



