Parasitic Fungi of [llinois. 151 
species. It has not been considered wise to try to give a full 
list of synonyms, yet such references are made in the notes as 
are needed to justify any departure from common usage in the 
selection of names. In a few instances changes have been 
made with much regret, since the current names are well es- 
tablished; but in these cases the law of priority clearly demands 
the substitutions made. For instance, the rust on the leaves 
of the common sunflower, and other allied plants, has long 
been known as Puccinia helianthi, Schweinitz. Probably no 
species of Puccinia is more commonly found or better recog- 
nized in the herbaria of our country, and nearly or quite uni- 
formly under the name quoted. But Schweinitz published this 
name in 1822 (Syn. Fungi Carol. p. 73), seven years after De 
Candolle had published the description of a species of Puccinia 
under the name of P. tanaceti (Flore France. II. p. 222). Now 
it is found that no specific difference can be maintained between 
these, and therefore the latter name must be adopted for the 
collections made in America as well as for those of Europe. 
T. J. BURRILL. 
Intinois InpustriaL UNIVERSITY, 
December 29, 1884, 
12 
