THE FUNGI 251 
potassium hydrate some time before they are to be examined. In 
the mycelial threads note : 
(a) The color (if any). 
(5) The mode of branching. 
(c) The presence or absence of cross-partitions. Draw. 
II. Conrpra. 
Examine with h.p. a slide prepared as in I, and note: 
(a) The size, shape, and color of the conidia. 
(©) The manner in which the conidia-bearing branches are 
Fic. 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. 
Ill. Toe Sac Fruvirs. 
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. 
1It may be easier to demonstrate rows of conidia in ‘‘ blue mold” (Peni- 
cillium) moistened in aleobol and then mounted in water. 
