217 



Some of the additional species mentioned are so rare that it was with diffi- 

 culty a good specimen was collected, while others are so abundant that it seems 

 strange they have not been previously reported. 



The collector's name, with date of collection, follows the name of the host, 

 and the specimens may be found in the herbarium of the persons named. Those 

 not so designated are in my own collection. 



Sincere thanks are extended to Dr. .J. C. Arthur for his assistance in the de- 

 termination of many of the host plants. 



^^idium asterum Schw. Very common. 



On Aster sp., 6, 1S9(). 

 ^t^cidium compositarum. As this is only a convenient name under which to 

 place forms found on composita^, the host holds an important part in the classifica- 

 tion. The form on Eupatorium was found in May and June, growing in marshy 

 ground. All plants observed were well covered with the ^Ecidia. 

 On Eupatorium per foliatum, 5, 6, 1896. 

 JEcidium euphorbiare Gmel. Common. 



On Euphorbia maculata, 8, 1887 (Arthur). 

 On Euphorbia dentata, 5, 1896. 

 ^Ecidium geranii DC. Rare. 



On Geranium macuiatum, 5, 1894 (Golden). 

 ^Ecidium impatientis Schw. Common. 



On Impatiens pallida, 6, 1896. 

 ^Ecidium oenotherce Pk. Common. 

 On Oenothera biennis, 6, 1896. 

 ^Ecidium pentastemonis Schw. was collected in the immediate vicinity of La- 

 fayette by Mr. Stuart, and although the species was found in abundance in that 

 particular locality, a close examination of the Penlstemon plants on the part of 

 others failed to reveal the parasite in other parts of the county. 



The spots are irregularly scattered over the leaf, appearing purple in the 

 fresh specimen, turning brown when dry. 



On Pentstemon pubescens, 5, 1896 (Stuart). 

 ^Ecidium Ptelea B. & C. Eare. 



On Ptelea perfoliatum, 6, 1896. 

 ^Ecidium ranunculacearum DC. 



Cultures have been made by Plowright working out the life history of the 

 species and thus connecting the first and third stages, but it is probable that the 

 American differs from the European forms. 

 On Anemone Pennsylvanica, 6, 1895. 



