THE PLANT GROUPS 93 



the material from each mold separately in water or 

 in a mixture of alcohol and glycerin. Study the 

 structures found in the colored and colorless portions 

 of your mounts. What do you conclude as to the 

 nature and function of these colored and colorless 

 portions of molds ? Are all molds which you examine 

 alike in the general structure of colored and colorless 

 parts ? 



c. Draw diagrams to illustrate the structures found in the 

 colored and colorless parts of various molds. See text 

 and figures on black and blue-green molds. 



4. Nutrition of molds (for example, apple mold). 



a. Method. Remove some of the pulp from a decaying 



apple with needles or the point of a scalpel and 

 place on the center of a glass slide. Add eosin solu- 

 tion and crush out gently under a cover glass. The 

 mold filaments, if present in the apple, will stain red 

 with eosin. 



b. Observation. Do you find mold filaments (hyphse) 



among the apple cells ? What is their function ? their 

 structure ? How are they related to the white aerial 

 mycelium and to the colored spores on the outside of 

 the apple ? Into what parts is the body of the apple 

 mold divided ? What is the functional relation of these 

 parts ? What kind of food would the mold secure 

 from apples ? How would it absorb it ? Compare the 

 income and outgo of apple mold with that of the wild 

 yeasts in apple or in cider. Draw a portion of the 

 apple mold as it appears within the apple. Include 

 the cells of the apple pulp surrounding the hyphae. 



5. Summarize briefly the distinctive characteristics of molds 



observed under the above topics, namely, Habitat, Habit, 

 Gross Structure and Growth, and Nutrition. 



