THE FUNGI. 155 



Show by a figure the manner in which the mycelium 

 branches. Are the branches of uniform diameter? If 

 not, state what differences you notice ; examine the ends 

 of the hyphie particularly. Treat another mount with 

 one per cent solution of osmic acid. A brown coloration 

 shows the presence of oil. This oil is one of the products 

 of the destructive metabolism of the protoplasm. 



References for Reading. Parker's " Elementary Biology," pp. 184- 

 191; Bidgood's "Elementary Biology," pp. 80-84; Dodge's "Practical 

 Biology," pp. 297-300; Huxley and Martin's "Practical Biology," 

 pp. 415-426; Strasburger and Hillhouse's "Practical Botany," pp. 

 259-261. 



EUROTIUM. PRACTICAL STUDIES. 



Eurotium first appears as a white, cottonlike growth; 

 later yellow spots develop. It grows so readily on poorly 

 dried plant specimens that it receives the name Herbarium 

 Mold. It is also found on old leather, boot blacking, and 

 various other substances. 



1. Mount a little Eurotium in water and examine the 

 mycelium under high power. Notice the septa. Draw a 

 typical case of branching. Run Schultze's solution under 

 the cover glass. Is the cell wall composed of normal or 

 of fungous cellulose? 



2. Study the asexual reproduction. Are the gonidio- 

 phores branched or unbranched? Are they divided by 

 septa? Describe the manner in which the gonidia are 

 borne. Draw a gonidiophore to which a considerable 

 number of gonidia are still attached. 



Make hanging drop cultures of the spores. Make draw- 

 ings on at least four different days, showing the progress 

 of the growth. 



3. Study the sexual reproduction. Material for this 

 study is to be obtained from Eurotium that has been grow- 

 ing for some time. It may be recognized as suitable by 



