4 



Mycologia 



♦ 



Explanation of Plate 34 (frontispiece) 



1. Mycelium grown on dextrose agar plate. X 1000. 



2. Aerial mycelium showing the fuscous tips of the branches, the beginning 

 of a sporodochium. X 1000. 



3. Young spores. X 1000. 



4. Young sporodochia in various stages of development. X 1000. 



5. Young sporodochium. X 1000. 



6. Outlines of spores, showing variety of septation. X 800. 



7. Spores, matured, showing septa. The distinctness of the walls is some- 

 what exaggerated. X 800. 



8. Germinating spores, showing the hyphae originating from several cells. 

 X 800. 



Explanation of Plate 35 



1. Microphotograph of young sporodochium on aerial hyphae. Some of the 

 spores may be seen to be septate. On dextrose N-free agar. X 1000. 



2. Microphotograph of single germinating spore. Note that the hyphae 

 originate from many points on the surface. Higher magnification shows the 

 spore to be multiseptate and hyphae originate from different cells, frequently 

 several from a single cell. X 400. 



This plate is reproduced by courtesy of the Iowa Agricultural Experiment 

 Station. 



