Entomogenous Fungi. 427 



spring from the interwoven threads composing the sporophore. 

 The conidia are borne in long chains on flask-shaped sterigmata 

 -which are gronped at the ends of short side branches. 



A dilution culture was made from this. The growth in agar 

 plates becomes apparent at the end of about twenty-four hours 

 after the sowing of the conidia. They become swollen and put 

 out one or two germ-tubes, usually at one or both ends of the 

 slightly oval conidia. The j^rotoplasm is homogeneous and hyaline. 

 At the end of two days, the growth becomes apparent to the un- 

 aided eye. Branching occurs freely, the branches tapering and 

 slightly constricted at the base. A few vacuoles appear and at the 

 end of three days a few septa are to be seen, usually just beyond 

 the point where a branch is attached. After about four days the 

 threads are thrust up out of the agar, and in two more the colonies 

 form beautiful, circular, cottony growths very hnely radiated. The 

 conidia now appear, borne on flask-shaped sterigmata which are 

 placed either singly or in groups of from two to twelve on the main 

 thread or on the end of a short side branch. The oval or nearly 

 spherical conidia are borne in chains at the apices of the sterigmata. 



A small depauperate form, probably of this species, was found 

 feeding on a group of insect's eggs (Fig. 93). This specimen pro- 

 duced two sporophores, recumbent for a short distance, and then 

 rising in a cylindrical mass of fibres for 6 or 7 mm. and bearing at 

 the apex a spherical head al)out 1 mm. in diameter. One of the 

 sporophores was forked just below the apex and bore two heads 

 packed with loose chains of creamy white conidia. Plate-cultures 

 from this specimen developed like those from the typical form, ex- 

 cept that the threads became somewhat more swollen. A specimen 

 found on decaying leaves showed a development coinciding exactly 

 with the typical form. 



On potato, the growth spreads rapidly over the entire surface, 

 forming a dense, white covering of considerable thickness. This 

 felt spreads evenly over the surface of the liquid and reaches to 

 the glass walls of the tube. Isaria-sporophores are produced which 

 grow directly away from the potato for a distance, when some of 

 them reach the sides of the tube and grow directly upward for 2|- 

 cm. or more, clinging to the glass, and flattening out considerably. 

 Many short, round, rudimentary sporophores are produced all over 

 the sides of the stick of potato. Tiie bases of the sporophores are 

 usually buff and the mycelium shows, where it touches the glass, a 



