THE FUXGI 



251 



potassium hydrate some time before they are to be examined. In 

 the mycelial threads note : 



(a) The color (if any). 



(b) The mode of branching. 



(c) The presence or absence of cross-partitions. Draw. 



II. CONIDIA. 



Examine with h.p. a slide prepared as in I, and note : 



(a) The size, shape, and color of the conidia. 



(6) The manner in which the conidia-bearing branches are 



Tig. 175. A Colony of Aspergillus, a Sac Fungus, one of the Com- 

 mon Molds, showing Mycelium and Spore-Clusters. The lower 

 figures show in detail the method of spore formation. 



attached to the mycelial threads and the way in which the conidia- 

 are cut off at the ends of these branches by cross-partitions.^ Draw. 



m. The Sac Fkuits. 



Prepare slides from- the material gathered at the end of summer 

 and at the fall of the leaf. Examine the yellowish or black sac 

 fruits with h.p. and note : 



(a) The shape of the fruits. 



1 It may he easier to demonstrate rows of conidia in " blue mold " {Peni- 

 cUlium) moistened in alcohol and then mounted in water. 



