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EXPLANATION OF PLATE I. 
Us7TinAGgo EHrytHrRontii Clinton. 
Page 115. 
. A leaf of Erythronium Americanum bearing the Ustilago. 
Two spores magnified 400 diameters. 
AGARICUS (HEBELOMA) FUSCODISCUS Peck. 
Page 95. 
A young plant. 
Three plants of ordinary size. 
Vertical section of a pileus. 
. Four spores x 400. 
DoruHIpDEA DALIBARDZ Peck. 
Page 109. 
. A leaf of Dalibarda repens bearing the Dothidea. 
. An ascus containing spores x 400. 
. Three spores x 400. 
SPH2ERIA ARCEUTHOBI Peck. 
Page 111. 
A plant of Arceuthobium pusillum bearing three tufts of the Spheria. 
A capsule bearing a tuft of the Spheria, magnified. ; 
Two perithecia more highly magnified. 
An ascus containing young spores x 400. 
Four mature spores x 400. 
Vaisa Peck Howe. 
Page 109. 
A piece of wood of Vaccinium corymbosum bearing clusters of the Valsa. 
A vertical section of a cluster and the surrounding wood magnified, 
An ascus containing spores x 400. 
Five spores, three of them immature, x 400. 
PERIDERMIUM DECOLORANS Peck. 
Page 104. 
Tip of a branch of Abies nigra, its leaves bearing the Peridermium. 
A leaf bearing three peridia, slightly magnified. 
A spore x 400. 
