122 



COMPARATIVE MORPHOLOGY OF FUNGI 



pierce the body wall, especially on the back of the fly and cut off a conid- 

 ium at each tip (Fig. 74, 1 and 2), into which as many as 18 nuclei enter. 

 Because of considerable water absorption, the conidiophores rupture 

 directly under the septum and discharge the spores with a part of the 



Fig. 74. — Entomophthora Muscae. 1, 2. Development of conidiophore. 3. Catenu- 

 late gemmae (azygospores?) within old conidiophore. (1, 2 X 720; 3 X 800; after Olive, 

 1906, Goldstein, 1923.) 



protoplasm so that the flies are surrounded by a ring of spores. In old, 

 dried-up flies, the hypnospores arise in masses as thick- walled, multinu- 

 cleate, intercalary swellings of the hyphae (Fig. 71, 3). Whether they 

 should be regarded as gemmae or azygospores is still obscure (Goldstein, 

 1923). 



Fig. 75. — Entomophthora Grylli. 1 to 3. Development of zygospore from hyphal body. 

 Entomophthora Fresenii. 4 to 7. Development of zygospore from two hyphal bodies. 

 (1 to 3 X 145; 4 to 7 X 290; after Thaxter, 1888.) 



The other species of Entomphthora show essentially the same charac- 

 ters as E. Muscae. For hypnospores they form both zygospores and 

 azygospores. In E. Fresenii, two hyphal bodies change into gametangia 

 and copulate (Fig. 75, 4 and 7), whereby the junction swells to a zygospore 



