STUDY 4. 
A MOLD. Mucor. 
A. Vegetative and Reproductive Stages. 
1. 
ee 
aa 
10. 
11. 
12. 
With m. observe the filaments (hyphe) which to- 
gether constitute the mycelium. If possible study 
the mold in an undisturbed position, e.g. on bread. 
The visible mycelium consists of aerial hyphe. 
What is the form and color of the filaments ? 
Is a filament composed of one or more cells? Is it 
branched ? 
At the distal ends of some erect hyphe note enlarge- 
ments (sporangia). What is their origin, form, and 
color ? 
If possible, find the stages of development of spo- 
rangia. 
With l.p. study the contents (spores) of a sporangium. 
What is their form? Why so abundant ? 
Are they formed by cell union or cell division ? 
Draw a few vegetative and reproductive hyphe of the 
mold and designate all parts. 
In the substratum hyphe, search for large, dark 
bodies (zygospores) between the filaments. What 
-is their origin ? 
Try to find the stages of this process, and if found 
make a drawing. 
Compare the zygospore of the mold with that of 
Spirogyra, as to the position, form, and method of 
formation. 
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