May, 1910.] The Ohio Powdery Mildews. 169 



Erysiphe galeopsidis DC. Practically the same as E. cicho- 

 racearum, except that the haustoria are larger and are lobed. 



Host plants in Ohio Herbarium: vStachys sp., Columbus, W. A. 

 Kellerman. 



Otherwise reported in Ohio: Sctxtellaria laterifolia, Columbus, A. D. 

 Selby, W. C. Werner, Fairheld 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 /« in diam- 

 eter; cells 10-20 ji, distinct; appendages numerous, 2-4 times the 

 diameter of the perithecium ; asci 10-15, stalked, 5<S x 30-90 x 50/< ; 

 spores 2, 20 x 12-28 x 20 /i; haustoria not lobed. 



Host plants in Ohio Herbarium: Helianthus tuberosus, Sandusky 

 Co., Sugar Grove, W. A. Kellernian ; Helianthus sp., Lancaster, W. A. 

 Kellerman, Columbus, H. H. Richardson; Asclepias syriaca, Cuyahoga 

 Co., E. Claassen; Vemonia 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 nccator 



Appendages colorless 2 



2. Asci 2-spored macrospora 



Asci 4-8-spored 3 



3. Appendages flexuous flexuosa 



Appendages straight 4 



4. Appendages thick- walled, dark or rough at base, perithecia 64-146^ 



in diameter, asci 34-40 p. w4de cUntoni 



Appendages thin-walled throughout 5 



5. Asci 4-6 spored salicis 



Asci 7-8 spored circinata 



Uncinula necator (Schw.) Burr. Perithecia scattered, 70-128 

 p. 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 /<; 

 spores, 4-7, 18 x 10-25 x 12 11. 



