V.] MOULDS. 39 



homogeneous sac; the granular less trans- 

 parent protoplasm ; the small round vacuoles. 

 Draw. 

 (3. The intermixed Tonda. Note their size and 



number. 



b. Hold a bit of the mycelium between two pieces 

 of carrot, and cut a thin vertical section with a 

 sharp razor : mount in water and examine with 

 low and high power. 



b. The submerged hyphae. 



Small branched threads hanging down from the under 

 surface of the mycelium : repeat the observations 

 2. a. a. a. 



c. The aerial hyphse and conidiophores. 



Tease out in water a bit from the surface of one of 

 the greenish patches; observe the difficulty with 

 which water wets it. Examine with low and high 

 power. 



Note ; 



a. The primary erect hypha. 

 (3. Its division into a number of branches, 

 y. The division of the terminal branches by con- 

 strictions into a chain of conidia. Draw. 



d. The conidia. 



a. Their Size (measure). 



Form; spherical. 



Structure; sac, protoplasm, vacuole. 



b. Stain with magenta and iodine. 



c. Treat another specimen with potash. 



