112 Wisconsin Academy of Sciences, Arts and Letters. 



37. MiCROSPHAERA. DIFFUSA C. & P. 



On Desmodiuni canescens D C , Lathyrus ochroleucus Hook, and 



Lesjoedeza violacea Pers. Madison; Delton, Devil's Lake. La- 



Crosse, Pammel. 



The form on Lathyrus lias the 8-12 hyaline appendagas 4-5 times forked, 



the ultimate divisions unequal, some of them straight, others recurved, 



closely resembling those of M. ravenelii B., which occurs on Gleditschia. 



They are also absolutely indistinguishable from those of M. pulclira C. & 



P., in my collection. Mr. Ellis writes, however, that this form does not 



differ more from Peck's specimens of M. diffusa than the latter do from 



those of Ravenel distributed by Cooke in Ravenel's Fung. Amer.; in the 



latter of which they are merely dichotomous and spreading as in my 



specimens on Desmodiuni, whereas in the former they are only a little less 



ornate than in my specimen on Lathyrus. Professor Peck also regards 



this as a form of his species. 



38. MiCROSPHAERA PULCHRA C. & P. 



On Lonicera flava Sims, and L. parviflora Lam. Madison; La- 

 Crosse, Pammel. 



39. MiCROSPHAERA VAN BRUNTIANA Gerard. 



On Sambucus canadensis L. Madison. 



40. MiCROSPHAERA PENICILLATA (Wall.). 



On Corylus americana Walt, and C. rostrata Ait. Very common in 

 the fall. Madison. 



41. MiCROSPHAERA EXTENSA C. & P. 



On leave of Quercus rubra L. Madison. 



42. MiCROSPHAERA RUSSELll Clinton. 



On Oxalis stricta L. La Crosse, Pammel. 



43. PoDOSPHAERA TRiDACTYLA (Wall.) (P. Jcunzei Lev., P. oxyacanthae, 



D a). 



Common, on leaves of cultivated cherry and plum, and on Prunus 

 virginiana L., causing the leaves to fold lengthwise, Madison, 

 Ithaca; La Crosse, Pammel. 



44. Phyllactinia suffulta (Reb.) (P. guttata. Wall.). 



On Celastrus scandens L., Carpinus americana Michx., Corylus 

 americana Walt, and species of Cornus and Fraxinus. Madison. 



45. Sphaerotheca castagnei Lev. 



Common, on Bidens frondosa L., Nabalus sp.. Taraxacum dens- 

 leonis Desf., Veronica virginica lj.,Rubus triflorus Rich., Brunella 

 vulgaris L. and Agrimonia eupatoria L. Madison; La Crosse, 

 Pammel. 



