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IOWA ACADEMY OF SCIENCE 
81. Microsphaera russellii Clinton. 
On Oxalis stricta L. Not conspicuous enough to be often 
noticed. 
82. Microsphaera euphorbiae (Peck) Berk. & Curt. 
On Euphorbia carollata L. Common. 
83. Uncinula necator (Schwein.) Burrill. 
On Parthenocissus quinquefolia (L.) Planch., and Vitis labrusca. 
L. This species appears to be more common and destructive 
on the former' than on the latter host. 
84. Uncmula circinata Cooke and Peck. 
On Acer saccharinum L. 
85. Uncinula maerospora Peck. 
On IJlums americana L. and U. raeemosa Thomas, Quite com- 
mon. In some cases it is conspicuous and in other cases not. 
86. Uncinula geniculata Gerard. 
On Morus rubra L. Inconspicuous and not often found. 
87. Phyllaictinia coryleia (Pers.) Karst. 
On Ostrya virginiana (Mill.) AYilld., Ulmus raeemosa Thomas. 
This species probably occurs on many other hosts but the 
writer has collected only on the two mentioned. 
UREDINEAE. 
88. Uromyces appendiculatus (Pers.) Lev. 
On Phaseolus vulgaris L. Sometimes destructive. 
89. Uromyces caladii Earl. 
On Arisaema triphyllum (L.) Schott. A dracontium (L.) 
Torr. 
90. Uromyces erythronii (DC.) Passer. 
On Allium canadense L. 
91. Uromyces euphorhiae Cooke & Peck. 
On Euphorbia maeulata L. Common. 
92. Uromyces fabae (Pers.) DeBy. 
On Apios tuberosa, Moench. 
93. Uromyces geranii (DC.) Warton. 
On Geranium maculatum L. 
94. Uromyces howei Peck. 
On Asclepias syriaca L. Common and somewhat destructive. 
95. Uromyces j unci (Desm.) Tul. 
On Juncus tenuis Willd. Common. 
