632 MINNESOTA BOTANICAL STUDIES. 



^cidium pedatatum (ScH\v.) nom. nov. 

 SYN. : 



1834. Cceoma (sEcidium ) pedatatum SCHW. Trans. 



Amer. Phil. Soc. 4: 293, no. 2885. 

 1834. Cceoma (sEcidium) sagittatum SCHW. Trans. 



Amer. Phil. Soc. 4: 293, no. 2886. 

 1672. j&cidium Maria- Wilsoni PK. 24th Rep. N. Y. 



Mus. for 1870 : 92. 



1874. -dZcidium Petersii^B. & C. Grev. 3: 61. 

 Exsicc. : 



Carleton, Ured. Amer. no. 28. 



Hetercecious, inhabiting species of Viola, and also of some 

 other genus of plants not yet determined. 



0. Spermogonia preceding the ascidia. 



1. ./Ecidia hypophyllous, seated on small, pale, circumscribed, un- 

 thickened spots ; cups usually sub-circinating, small, shallow or short 

 cylindrical, white, border narrow, often much split and somewhat re- 

 curved ; spores subglobose, in part angular from compression, epi- 

 spore thin, minutely verrucose, n to 18 //, averaging 14, a. 



Throughout the United States east of the Rocky mountains, 

 from March to June on the blades of various species of violets, 

 and less often on the petioles, pedicels and calyx. Specimens 

 have been examined as follows : 



On Viola obliqua HILL. Pennsylvania (Schweinitz), Maine 

 (Blake), Indiana (Arthur), Illinois (Seymour, Arthur), 

 Iowa (Holway), Kansas (Bartholomew, Carleton). 



On Viola ovata NUTT. New Jersey (Ellis). 



On Viola sagittata L. Pennsylvania (Schweinitz), Massa- 

 chusetts (Asa Gray). 



On Viola pedata L. Pennsylvania (Schweinitz), Alabama 

 (Baker), Iowa (Holway). 



On Viola pedatifida DON. Kansas (Kellerman), Iowa 

 Holway). 



On Viola primulcef alia L. District of Columbia (Greene), 

 Mississippi (Tracy). 



On Viola Nuttallii PURSH. Kansas (Bartholomew). 



On Viola striata AIT. North Carolina (Biltmore Herba- 

 rium). 



On Viola tricolor L. Kansas (Popenoe). 



The form here described is undoubtedly part of an hetercecious 

 species, having the alternate forms possibly upon carices. It 



