128 MORPHOLOGY AND LIFE HISTORY 



4. Make a drawing, about 25 mm. in longest diameter, 

 showing the appearance of this fungus as it grows on 

 the body of the fly. 



D. Microscopic Characters: 



1. With the needle or scalpel carefully remove a few 

 filaments and mount them in water. Examine 

 with the low power. 



2. Make careful comparisons of the tips of hyphae 

 enlarged to form sporangia with those not thus 

 modified. Describe the appearance of the contents 

 in each. 



3. Do you find any cross- walls in the filaments? 



4. Do you find vacuoles? Plastids? Nuclei? 



5. Make a drawing showing the appearance of the tip 

 of a vegetative filament (10 mm. in diameter). 



E. Nutrition and Growth: 



1. See if you can find hyphae bearing empty sporangia. 

 If so, do you find the hypha continuing its growth 

 in length within the empty sporangium? Illus- 

 trate this point by a drawing. 



2. Where do the vegetative hyphae (mycelium) grow? 

 Describe the nature of the surface of the fly's 

 body. How can the delicate mycelia penetrate to 

 the interior of the fly? 



3. Upon what does this fungus feed? State in detail 

 the necessary steps in the process of getting this food 

 into the interior of the mycelium. In this connec- 

 tion make comparisons with Phycomyces (see F, 4, 

 under Phycomyces, p. 125). 



4. Is there any correlation here between the absence of 

 chlorophyll and the habitat of the plant? If so, 

 explain, and compare with Phycomyces and with 

 Spirogyra. 



