EXPLANATION OF PLATE I. 

 Ustila g o Er ythr onii Clinton. 



Page 115. 

 Fig. 1. A leaf of Erythronium Americanum bearing the Ustilago. 

 " 2. Two spores magnified 400 diameters. 



Agaricus {Hebeloma) fuscodiscvs Peck. 



Page 95. 

 Pig. 8. A young plant. 

 " 4. Three plants of ordinary size. 

 " 5. Vertical section of a pileus. 

 " 6. Four spores x 400. 



Dothidea Dalibarbm Peck. 



Page 109. 

 Fig. 7. A leaf of Dalibarda repens bearing the Dothidea. 

 " 8. An ascus containing spures x 400. 

 " 9. Three spores x400. 



Spejeria Arceuthobii Peck. 



Page 111. 

 Fig. 10. A plant of ArceutJwbium pusillum bearing three tufts of the Sphaeria. 

 " 11. A capsule bearing a tuft of the Sphaeria, magnified. 

 " 12. Two perithecia more highly magnified. 

 " 13. An ascus containing young spores x 400. 

 " 14. Four mature spores x 400. 



Valsa Peckii Howe. 



Page 109. 

 Fig. 15, A piece of wood of Vaccinium corymbosum bearing clusters of the Valsa 

 " 16. A vertical section of a cluster and the surrounding wood magnified. 

 " 17. An ascus containing spores x 400. 

 ' ' 18. Five spores, three of them immature, x 400 



P ERIBERMIUM BE COL OR A NS- Peck. 

 Page 104. 

 Fig. 19. Tip of a branch of Abies nigra, its leaves bearing the Peridermium. 

 " 20. A leaf bearing three peridia, slightly magnified. 

 " 21. A spore x 400. 



