102 
the pruning lias lowered its vitality and rendered it liable to the dis¬ 
ease. 
Vibrissea hypogcect lias also been found at Ames on an old dead grape 
root. 
White rust of beets. —Late in October, when the beets were being 
harvested, one of the students, Mr. W. Zmunt, brought a leaf of the 
common beet, which showed several white pustules which proved to be 
a Cystopus . A careful search through other herbaria lias shown more 
specimens. I have not seen the oospores, so I can not say to which 
species it belongs, but the conidia resemble those of Cystopus bliti (Biv.) 
de Bary. This has not been recorded as occurring on any of the Clienopo- 
diacea? in the United States. Frank,* * * § Sorauer,t Berlese, and De Tonif 
record it as occurring on Chenopodium , a genus closely related to Beta, 
Here again we are confronted with the question why this Cystopus 
should affect the beet in Iowa and apparently has not been found on 
this host in other parts of the world. It certainly seems that if the 
fungus had occurred commonly it would have been observed before. 
III. —FOREST TREES. 
Thus far I have not observed Gloeosporium nerviseguum on sycamore 
trees in the vicinity of Ames, but a fungus giving the leaves of JEscnlus 
glabra: a similar scorched appearance was found early in August. It is 
due to the parasitic fungus Phyllosticta sphceropsoidea , E. and E. By 
the middle of September many of the leaves were dry and had fallen 
from the trees. 
Cedar-apple fungus. —So far as I know the only recorded species 
for this locality is Qymnosporangium macropus, but last spring a sec¬ 
ond species, G. globosum , was found infesting one of the cedars. G. 
macropus is the common species in Illinois, Wisconsin, and Iowa, and 
I think is the common “cedar apple” in most parts of the United 
States. Dr. Halsted§ concluded that we have only one species in this 
locality. I found only a single specimen of the other after a diligent 
search. It might in this connection be interesting to state that some of 
the wild crab apples close to Juniper us Virginiana have been so severely 
attacked by Beesteliapyrata that not only was every leaf affected but the 
fruit and young branches as well. The young branches usually died, 
so that the trees are in a bad condition. It was also noticed that be¬ 
fore Gymnosporangium macropus appeared the leaves coming from the 
small lateral branches were yellow, as if they had been infested by the 
fungus. Other duties have prevented my studying these early yellow 
* Kranklieiten der Pflanzen, p. 419. 
t Pflanzenkrankheiten, Vol. n, p. 175. 
+ Saccardo Sylloge fungorum, Vol. vii, p. 236. 
§ Halsted, Bull. Iowa Agric. College, Botanical Dept., 1886, p. 63. Report U. S. Dept. 
Agriculture, 1888, p. 370. 
