EXPLANATION OF PLATE II. 



Aspergillus clavellus, Pk. 

 Page 49. 

 Fig. 1. A tuft of the fungus with its matrix. 

 Fig. 2. Three plants magnified. 

 Fig. 3. Upper part of a plant with most of the spores removed, more highly 



magnified. 

 Fig. 4. A group of spores x 400. 

 Fig. 5. A string of spores with its basidium more highly magnified. 



Helicomyces mirabilis, Pk. 

 Page 46. 

 Fig. 6. A piece of a corn cob bearing the fungus. 

 Fig. 7. Threads of the fungus x 400. 

 Fig. 8. A coiled spore x 400. 

 Fig. 9. A spore partly uncoiled x 400. 

 Fig. 10. A fragment of a spore x 400. 



Verticillium candidum, Pk. 

 Page 48. 

 Fig. 11. A piece of wood bearing a patch of the fungus. 

 Fig. 12. A plant with spores x 400. 

 Fig. 13. Six spores x 400. 



Cercosporella reticulata, Pk. 

 Page 47. 

 Fig. 14. A leaf discolored at the apex by the fungus. 

 Fig. 15. A group of flocci x 400. 

 Fig. 16. Three spores x 400. 



Periconia sph^rophila, Pk. 

 Page 50. 

 Fig. 17. A patch of the fungus with its matrix. 



Fig. 18. A plant and the perithecium from which it grows magnified. 

 Fig. 19. Upper part of a plant with spores more highly magnified. 

 Fig. 20. Six spores x 400. 



