Entomogenous Fungi. 437 



by several threads growing together for some distance. The growth 

 appears above the agar in about ten days. The colonies continue to 

 grow and branch until, at the end of about two weeks, they form 

 even, fluffy, and strongly raised colonies. Soon after this, conidia 

 are produced on tlasked-shapedsterigmata, which are either sessile or 

 borne on short side branches. These sterigmata and the chains of 

 conidia become crowded so as to form heads of some size like those 

 of Sporortnchum (Figs. 26, 27, 28, and 30). 



On potato the growth starts from the points of inoculation and 

 grows until, at the end of about a week, it appears as a lobulated 

 white mass, strongly raised from the surface of the potato. The 

 pure white mycelium contrasts strongly with the potato which is 

 colored a deep purple by the fungus. After about two weeks the 

 conidia give the growth a creamy, farinaceous appearance. 

 Wherever the felty membrane resting on the surface of the liquid 

 comes in contact with the glass tube, a delicate fringe of very line 

 white threads runs up which cling to the glass and preserve per- 

 fectly parallel courses. Culture in half-litre Ehrlmeyer flasks 

 showed exactly the same method of growth. Gelatine is colored 

 a deep vinaceous purple when the fungus is grown in it. 



On October 31, 1893, twenty larvge of Lachnosterna were 

 infected with Isariaderisa in the following manner : Twenty grubs 

 were placed in an earthen dish containing soil to the depth of 

 about 1 cm. Half the contents of the tube just received from 

 Fribourg and Hesse was mixed with half the white of an egg^ and 

 15 cc. of water added. This was beaten and each grub carefully 

 touched behind the head and along the sides with the liquid. The 

 remainder of the liquid was poured over them and the dish and grubs 

 covered with moist moss, and placed in a room of ordinary temper- 

 ture. On November 1 st, the grubs were placed in two pots, ten in 

 each, and covered with earth and moss full of conidia. Wheat was 

 sown over the surface of the soil. On ISTovember 14th, five were 

 dead ; two had just died and were very much swollen. On Novem- 

 ber 20th, the swollen ones were pink. One of them was firm and 

 apparently full of mycelium ; the other was attacked by bacteria and 

 became a putrid mass. Several of the grubs were the centers of 

 nodules of vegetable matter and soil, but the fungus binding them 

 together proved to be a harmless Mucor. One grub was seen on 

 November 29th, which bore a white fungus on the surface. It was, 



