3. What is its food and how does it take it ?

Experiments 6, 10, and 8.
4. Why does mold grow on bread and on fruit?

5. What conditions are necessary for its growth ?

6. Why does it not have chlorophyl ?

7. Why is the mold always on the surface portions of

fruits preserved in liquids ?

8. Why is it that mold will not grow on clean, moist

sand or in pure water?

9. What is the purpose of the sub-stratum hyphse ?

10. Of what advantage is the horizontal position of most
of the aerial hyphae ?



STUDY 5.
VAUCHERIA. Oreenfelt

A. Vegetative Stage.
1. Under what conditions does this plant grow?

2. What is its general appearance ?

3. How could you distinguish this plant from Spirogyra?

4. With l.p. study mounted specimen. What is the

form of the plant ?

5. Is it composed of cells and does it branch ?

6. What is its color and how are the chromatophores

arranged ?

7. With h.p. study carefully. What cell structures do

you observe ?

8. Round or oval bodies from which filaments arise are

germinating spores. If found, study carefully and
sketch. What is their origin ?

9. Colorless root-like structures are rhizoids. Do you

find them and, if so, how do you explain their
color and function ?

10. Apply iodine and note results. What explanation

can you give for results ?

11. Make a sketch of a filament showing branching, and

designate all parts.
B. Reproductive Stage.
1. How many kinds of branches are there?

2. What is their relation to the main filament ?

3. How do the distal ends of the branches compare ?

9



10 STUDIES OF PLANT LIFE.
