STUDY 3. 
SPIROGYRA OR ZYGNEMA. 
A. Vegetative Stage. 
Geb 
11. 
12. 
What is the form of the plant body? 
What color is it and does the color vary? 
What do you observe by feeling it? 
If composed of cells, what is their exact form and 
arrangement? 
With lp. or h.p. study cell structures. If color 
bodies (chromatophores) are present, note their 
number, structure, and arrangement. Is cyto- 
plasm present in other regions of the cell ? 
To what is the color due? 
Experiment 14. 
The enlargements in the chromatophores are nodules. 
Observe their abundance and distribution. 
Is the nucleus easily observed? Apply iodine and 
note the result. 
Apply to a fresh specimen a 5 per cent salt solution 
and observe the effect. 
. Does the plant have a jelly-like sheath? 
Experiment 14. 
What difference, if any, do you observe in the end 
cells? Why? 
Draw two or more cells and designate all the parts 
and structures. 
5 
