54 
IOWA ACADEMY OF SCIENCE 
cloronicokles Lam., Heliopsis scahra Dunal, Parietaria pennsylvanica MuhL, 
Plantago major L.. P. Rugelii Decn., ^Verbena bracteosa Michx., *y. Tiastata L., 
y. stricta Vent., *y. urticaefolia L, 
Our commonest species of the family, infecting a wide range of herbaceous 
hosts and consequently showing considerable variability. Reported by Fink 
on Ambrosia psilostacJiya DC., Aster laevis L., Aster sagitufolius Willd., Aster 
sp. indet., Helianthus annuus L., Phlox Drummondii Hook., Soliclago cana- 
densis L., S. rigida L., and serotina gigantea (Ait.) A. Gray. 
41. Eeysiphe galeopsidis DC. 
^ Conidia on Mentha canadensis L., and Stachys palustris L. are referred here. 
Reported by Fink on Scutellaria lateriflora L. 
42. Erysiphe geaminis DC. 
On Poa pratensis L. 
Not uncommon, especially the conidia. Reported by Fink on Cinna arun- 
dinacea L. 
43. Microsphaeea Alni (Wallr.) Winter. 
On Cornus alternifolia L. f., *Corylus americana L., ^Lonicera Sullivantii 
A. Gray, L. tartarica L., Ostrya virginica (Mill.) Willd., Quercus velutina Lam., 
^Syringa vulgaris L., and Viburnum lentago L. 
Common and usually abundant on a number of woody plants and quite 
variable, both in habit and character. Even upon the same host the myceliom 
may remain very conspicuous after the perithecia are mature or it may dis- 
appear completely. Reported by Fink on the following additional hosts: Car- 
pinus caroliniana Walt., Eonymous atropurpureus Jacq., and TJlmus americana 
L. 
44. Miceosphaera Aeni Extensa (Cooke & Peck) Salmon. 
On ^Quercus alba L., and Q. velutina Lam. 
Common on sprouts but not seen on full grown trees. Reported by Fink on 
Q. rubra L. 
Miceosphaera geossulariae (Wallr.) Lev. 
Reported by Fink on Sanbucus canadensis. 
45. Miceosphaera diffusa Cooke & Peck. 
On Desmodium sessilifolium (Torr.) T. & G. (Meibomia sessilifolia Kuntze). 
A single collection in Dover Township. 
46. Miceosphaera Russellii Clinton. 
On *Oxalis stricta L. 
Not uncommon. 
Miceosphaera Euhorbiae (Peck) Cooke & Peck. 
Reported by Fink on Euphorbia corollata L. 
47. Uncinula salicis (DC.) Winter. 
On Salix humilis Marsh. 
Very abundant. Also reported by Fink on an unidentified species of Salix. 
