DIFFUSED LIGHT ON MOLDS 



207 



6. What is the term applied to this type of action? 

 How are mold spores influenced by light? What influence 

 does diffused light have on other microorganisms? Is it 

 to be expected that other common molds, Penicillium, 

 Oospora, Aspergillus, etc., would exhibit this same phenome- 

 non? 



7. Give all data and observations in detail. Draw any 



FIG. 44. Phototropism Exhibited by Rhizopus nigricans. The 

 mold was grown on gelatin with diffused light coming from the 

 right side. (From Marshall.) 



conclusions that follow and point out any practical applica- 

 tions. 



REFERENCES 



MARSHALL: Microbiology, pp. 162-165. 

 JORDAN: General Bacteriology, 4th Ed., p. 73. 



