MICROSPH&RA FRIESII. 53 



2. The color. 



B. THE CONIDIA. Notice 



i. The pulverulent appearance on the leaves first gathered, 

 caused by the abundant conidia. 



C. THE FRUIT. Notice 



1. The black dots on leaves gathered later in the season, 

 the spore-fruits or perithecia. 



2. Associated with the black dots, other yellow ones, the 

 immature fruits. 



MINUTE ANATOMY. 



A. THE MYCELIUM. Scrape the fungus from the sur- 

 face of a leaf gathered in early summer, having first 

 moistened it with potassic hydrate if the specimen is a 

 dried one, and under high power notice 



1. The colorless filaments of the mycelium. 



a. The branching. 



b. The irregular diameter. 



c. The rarity of partition walls. 



2. Small lateral expansions of the filaments, haustoria, 

 somewhat like irregularly indented disks with very 

 short thick stalks. Generally difficult to find. 



3. Draw. 



B. THE CONIDIA. Prepare a slide as before from a pul- 

 verulent surface, and notice 



1. The abundant conidia, separated and free, owing to the 

 manipulation. 



a. Their shape and color. 



b. The cell-wall and contents. 



2. The conidia-beartng branches, or conidiophores, which 

 leave the mycelial filaments at right angles, and are 

 provided with cross partitions at regular intervals, and 



