May, 1910.] 
The Ohio Powdery Mildews. 
1 69 
Erysiphe galeopsidis DC. Practically the same as E. cicho- 
racearum, except that the haustoria are larger and are lobed. 
Host plants in Ohio Herbarium: Stachys sp., Columbus, W. A. 
Kellerman. 
Otherwise reported in Ohio: Scutellaria laterifolia, Columbus, A. D. 
Selby, W. C. Werner, Fairfield Co., A. D. Selby; Stachys aspera glabra, 
Columbus, W. A. Kellerman; Stachys palustris, Columbus, A. D. Selby; 
Chelone glabra, Ashtabula Co., Sara F. Goodrich. 
Erysiphe cichoracearum DC. Perithecia 80-140 y in diam- 
eter; cells 10-20 //, distinct; appendages numerous, 2-4 times the 
diameter of the perithecium ; asci 10-15, stalked, 58 x 30-90 x 50// ; 
spores 2, 20 x 12-28 x 20 /r; haustoria not lobed. 
Host plants in Ohio Herbarium: Helianthus tuberosus, Sandusky 
Co., Sugar Grove, W. A. Kellerman; Helianthus sp., Lancaster, W. A. 
Kellerman, Columbus, If. H. Richardson; Asclepias syriaca, Cuyahoga 
Co., E. Claassen; Vernonia gigantea, Portage Co., Cuyahoga Co., E. Claas- 
sen ; Ambrosia trifida, Columbus, F. L. Stevens, Cuyahoga Co., E. Claas- 
sen; Aster sp., Columbus, F. L. Stevens, Amanda, W. A. Kellerman, 
Georgesville, E. V. Wilcox; Hydrophyllum macrophyllum, Columbus, 
A. Brooks, Cincinnati, W. H. Aiken; Ambrosia artemisiaefolia, Columbus, 
F. L. Stevens, Cuyahoga Co., E. Claassen; Aster paniculata, Vernonia fas- 
ciculata, Solidago canadensis, Verbesina alternifolia, Cuyahoga Co., E. 
Claassen; Verbena hastata, Cuyahoga Co., E. Claassen, Lancaster, W. A. 
Kellerman, Columbus, C. M. Weed; Aster laevis, Eupatorium perfoliatum. 
Aster novi-belgii, Cuyahoga Co., E. Claassen ; Verbena urticaefolia, Cuya- 
hoga Co., E. Claassen, Amanada, W. A. Kellerman ; Phlox divaricata, 
Hamilton Co., W. H. Aiken; Phlox (cult) Fairfield Co., W. A. Kellerman; 
Actinomeris squarrosa, Columbus, C. M. Weed, Amanda, W. A. Kellerman, 
Toledo, F. D. Kelsey. 
Otherwise reported in Ohio: Parietaria pennsylvanica, Columbus, 
A. D. Selby; Hydrophyllum macrophyllum, Pickaway Co., W. A. Keller- 
man, Fairfield Co., A. D. Selby; Dahlia (cult), Fairfield Co., W. A. Keller- 
man, Columbus, A. D. Selby; Helianthus sp., London, Mrs. K. D. Sharp. 
Uncinula Lev. 
Key to the Ohio species. 
1. Appendages colored one-half their length or more necator 
Appendages colorless 2 
2. Asci 2-spored macrospora 
Asci 4-8-spored 3 
3. Appendages flexuous fiexuosa 
Appendages straight 4 
4. Appendages thick-walled, dark or rough at base, perithecia 64-146// 
in diameter, asci 34-40 y wide clintoni 
Appendages thin-walled throughout 5 
5. Asci 4-6 spored salicis 
Asci 7-8 spored circinata 
Uncinula necator (Schw.) Burr. Perithecia scattered, 70-128 
a in diameter ; cells distinct, 10-20 //; appendages 7-32 in num- 
ber, 1-4 times diameter of perithecium; simple, septate, brown in 
lower half; asci 4—7, sometimes short-stalked, 50 x 30-60 x 40 y; 
spores, 4—7, 18 x 10-25 x 12 y. 
