154 
Davis—Wisconsin Parasitic Fungi. 
Iowa, for invaluable assistance in various ways; To Mr. J. B. 
Ellis of Newfield, N. J., who has determined a large propor¬ 
tion of the specimens upon which the list is based, and to Prof. 
Chas. H. Peck of Albany, N. Y., and Prof. W. G-. Farlow, of 
Cambridge, Mass., who have kindly examined specimens sent 
them. 
Racine, Wisconsin, February, 1893. 
ADDITIONAL HOSTS AND NOTES. 
It happens that botanists separated by space, time or lan¬ 
guage, unwittingly describe the same thing, each under a dif¬ 
ferent name. To reduce the confusion caused thereby it is 
necessary to have a general rule to be applied in all such cases. 
The rule which has been adopted for that purpose is that the 
name first published shall be taken. The white rusts have been 
universally known by the generic name Gystopus. It is found 
however, that the name Albugo had been previously used in thal 
connection. It seems to me that in such a case the “law of 
priority” should not operate because the exigency it was de¬ 
signed to meet did not exist. The generic name Albugo having 
been revived, however, it seems necessary to adopt it to obvi¬ 
ate the confusion due to its resuscitation. It appears to me 
that in the strict application of the “law of priority” the means 
are sometimes unduly exalted above the end. Our white rusts 
then would stand as follows: * 
4. Albugo candidus, (Pers.) O. Kuntze. (Gystopus candidus, 
P., Prelim. List.) Also on Gakile Americana , 
Nutt. Racine. 
5. Albugo tragopogonis, (Pers.) S. F. Gray. ( Gystopus 
cubicus , (Strauss) Lev., Prelim. List.) 
This was rather abundant on Gnicus arvensis, Hoffm., in 
waste ground on the outskirts of the city of Racine in 1886. I 
have not seen it on this host since. 
* The numbers attached are those under which they were enumerated in the Preliminary 
List. 
