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10. 
11. 
12. 
13. 
14, 
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. An alder catkin coated by the fungus. 
. A conceptacle and its mycelium magnified. 
. A sporangium containing spores x 400. 
PLATE II. 
ERYSIPHELLA AGGREGATA Peck. 
Page 63. 
MIcROSPHZRA ABBREVIATA Peck. 
Page 64. 
Part of the circumference of a conceptacle and two appendages x 400 
. A sporangium containing spores x 400. 
VENTURIA KAatMix Peck. 
Page 82. . 
. A leaf bearing the fungus. 
. A perithecium magnified. 
. An ascus containing spores x 400. 
. Spores x 400. 
VALSA MUCRONATA Peck. 
Page 74. 
Piece of a branch bearing the fungus. 
A single cluster of the fungus magnified. 
An ascus containing spores x 400. 
Spores x 400. 
SPH#RIA EXIMIA Peck. 
Page 78. 
Several perithecia attached to the matrix. 
A perithecium magnified. 
An ascus containing spores x 400. 
Spores x 400. 
SPH#RIA MIRABILIS Peck. 
Page 80. 
. Part of a leaf bearing the fungus. 
g. 19. 
. 20. 
. Spores x 400. 
A perithecium magnified. 
An ascus containing spores x 400. 
