224 ARTHUR-BISBY— TRANSLATION OF SCHWEINITZ'S 



Schweinitz's inclusion of Geranium carolinianum as one of the 

 hosts must have been a hasty generalization. A specimen of this 

 plant in the phanerogamic herbarium at the Philadelphia Academy 

 of Sciences, obtained by Schweinitz at Salem, shows that he was 

 familiar with the plant, but no aecia are known to have ever been 

 collected on the species, or on any American Geranium with similar 

 leaves. 



Although Schweinitz adopted Link's name, yet Link hesitated to 

 place the American rust under his species, and properly so as time 

 has proven. Link's form is a stage of Uromyces Geranii (DC.) 

 Otth & Wartm., an entirely different rust. 



The Schweinitz form is the jecial stage of Puccinia Polygoni- 

 amphibii Pers., as established by cultures in both this country and 

 Europe. Recently some European mycologists have considered 

 that the American form of this widespread species should be treated 

 as distinct from the European form. But it would doubtless be 

 better to consider the species as made up of a number of more or 

 less distinct races, and that the common form in America is a race 

 different from the common form in Europe. 



2880. 70. C. A. Impatientatum, L.v.S., Syn. Car. 442, Link pag. 57 in a note, 



also Bethlehem. 

 (442. 13. [iEcidium] Impatientis Sz. 



A. effuse, large, becoming pale, peridia in the center, sparse, 

 crenate, spores rather large, yellow-fuscous, simple. 



Frequent in May on the leaves of Impatiens maculata. It swells 

 the leaves and stains a broad yellowish spot, darker in the center.) 



Represented by part of a leaf, about 3 cm. long, and 2 cm. wide, 

 mounted, bearing a single large group of secia, and by an empty 

 packet labelled inside "^cidium Lupatientis Salem," and outside 

 "yEcidium Impatientat LvS Salem." 



Link, at the place cited, indicated the possibility that this form 

 might belong with the preceding one. It is, however, different, 

 although having much similarity in gross appearance. It is, in fact, 

 the secial form of the American Puccinia Impatientis (Schw.) Arth. 

 (P. perminuta Arth.), having telia on Elymns, Agrostis and other 

 grasses, as proven by cultures. The name was changed by Schwei- 

 nitz to ^cidium (Cccomu) impatientatum on page 309 of his later 

 work. 



