Prelimincu'ij List of Wisconsin Parasitic Fungi. 113 



46. Sphaerotheca pannosa (Wall.). 



On Rosa parviflora Ehr., and on cultivated roses. 

 The mildew, or mycelium bearing conidia, is very common through the 

 summer and fall, injuring some of thi raoss-ros^s very greatly. The 

 perithecial fruit, on the contrary, is uncommon, and seems to form prefer- 

 ably on wild rose?, rather late in the fall. 



47. Erysiphe tortilis (Wall.). 



On leaves of Clemcttis virginianci L., in summer and faU. Madison; 

 Devil's Lake, Pammel. 

 No. 55S of Ellis' Nor h American Fungi, on the same host, distributed 

 under the name of Erysiphe communis Schl., seems to belong to this 

 species. 



48. Erysiphe lamprocarpa (Wall.). 



Very common, on Ambrosia artemisiaefolia L., Helianthus stru- 

 mosus'L., Aster miser Ti. , A. laevish., Xanthium strumarium L., 

 Cnicus discolor Muhl., Diplopappiis umbellatus T. & G., Eu- 

 patorium perfoliatum Li , E. pwpureumLi., Phlox paniculata L., 

 P. drummondii Hook., Teucrium canade^ise L., Hydrophylliim 

 virginicum L., Echinospermum virginicum Lehm. and Verbena 

 urticifolia L. 



49. Erysiphe communis (Wall.). 



Oa Ranunculus abortivuslj., Lathy riis venosus Muhl. and Amphi- 

 carpaeamonoica Nutt. Madison. 

 Conidia, apparently of this species, are also very common on Thalietruni 

 dioicum L. 



50. Erysiphe graminis D C. 



On Poa pratensis L. Madison. Common, through the season, in shaded 

 places. 

 Only the conidia {Oidium monilioides Lk.) have been found, but there 

 can be litt'e doubt that they belong to this species, the perithecial fruit 

 of which forms most frequently on the old leaves. 



PYRENOMYCETES. 



51. Phyllachora LESPEDiZAE (Schw.) {Dothidea lespedezae, Scliw.). 



On leaves of Lespedeza capitata Michx., in summer. La Crosse, 

 and Hokah, Minn., Pammel. 



52. Phyllachora PTERiDis (Reb.) (Dothidea pteridis Fr.). 



The Pycnidia occur on fronds of Pteris aquilina L., from Milwaukee, 

 in the Lapham herbarium. 



