EXPERIMENT STATION BULLETINS. 



677 



DESCRIPTION OF PLATES. 



Plate 1. 



Diseased plant showing killing of lower leaves. 



Plate 2. 



Fig. 1. The disease as found in the field. 

 Fig. 2. Diseased spots X 5. 



Plate 3. 



Fig. 1. Van Tieghem cells with distilled water and nutrient glucose agar. 

 Fig. 2. Plants used in transpiration experiment. The pots are inside of cheese cartons 

 which are cemented to Petri dishes with paraffin. 



Plate 4. 



Fig. 1. Pycnidium in the leaf, showing spores pushing out, thus making the ostiole. 



X 2.50. 

 Fig. 2. Test tuhe cultures on tomato agar and nutrient glucose agar showing spore 



exu(1ation. 

 Fig. 3. Section of sub-stomatal chamber of leaf showing entrance of mycelium. X 1,000. 



Plate 5. 



Fig. 1. Pycnidum before arisal of spores showing mycelial strands running across the 



cl'amber. X 750. 

 Fig. 2. Magnified camera drawing showing nature of young pycnidial wall. X 750. 



Plate 6. 



Fig. 1. Mycelium in hanging drop culture showing arisal of secondary spores, and 



heavy-walled mycelium. 

 Fig. 2. Mycelium between the cells of the host, sending blunt, tubular haustoria into 

 the cells. X 1,000. 



Plate 7. 

 Fig. 



Fig. 2. 



Pycnidium on a tomato leaf, showing relation of spores and adjacent tissue 

 to ostiole formation. X SOO. 



Pycnidium from test tube culture showing spores masses pushiag into agar. 

 X 300. 



Plate S. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



1. Spore showing globose ends. 



2. Germinating spores producing secondary spores. 



3. Secondary spore germinating. 



4. Mycelium producing secondary spores (corn meal agar). 



5. Mycelium branching, no secondary spores (nutrient glucose agar). 



Plate 9. 



Fig. 1. Germinating spore (tomato agar). 



Fig. 2, 4 and 5. Stages in colony formation. 



Fig. 3. Spore germinating by elongation of both ends, (nutrient broth). 



Fig. 6. Mycelium with secondary spores, and heavy brown threads (corn meal agar). 



Fig. 7. Mycelium (nutrient glucose agar). 



Fig. 8. Pycnidium formation (corn meal agar). 



