JOURNAL OF MYCOLOGY. 
Vol. IV. MANHATTAN, KAN., April, May, 1888. Nos. 4, 5. 
NOTES ON WESTERN ERYSIPJIE.E AND 
PERONOSPOREHE. 
BY S. M. TRACY AND B. T. GALLOWAY. 
During the past two years the writers have collected Erysipliece and 
Peronosporece in Missouri, Wisconsin, Colorado, New Mexico, Utah, Ari¬ 
zona and southern California. It has been a matter of no little surprise 
to them to find how wide is the distribution of most species of Erpsiphew, 
there being very few mentioned in any of the catalogues published in the 
western states which have not been found in widely separated localities. 
The distribution of most species has been found to be much wider than is 
that of any one of its hosts. Where a species is commonly limited to 
plants of a single order in any locality, it has not in any case been found 
on plants outside that order, although in some cases when new genera 
were noted in the flora, the fungus was no longer found upon the hosts 
where first observed. As an instance of this, Podosphcera oxycanthce is 
frequently found on several species of Crataegus and Primus in the Mis¬ 
sissippi valley, while in the Rocky Mountain region, where both Crataegus 
and Prunus are found abundantly, the Podosphcera is found on Prunus 
demissa , a near relative of P. Virginiana and has not been noted upon 
Crataegus or P. Virginiana , which are both abundant. In the west, 
Erysiphe cichoraceareum, DC., takes Stachys palustris as its host in the 
place of Teucriuni in the east ; Meiiensia, the place of Hydrophyllum; 
and many other similar instances will be noted in the accompanying list. 
The number of Peronosporece found in the arid regions was very small, 
and the few which were taken were, without exception, found high on 
the mountains or in deep mountain canons, where the melting snows 
furnished constant and abundant moisture. The accompanying list does 
not claim to approach completeness except for Missouri, the notes from 
other states being added simply as a matter of record. 
ERYSIPHEYE. 
Sph^erotiieca Castagnei, Lev.—On Taraxacum officinale, Bidens 
frondosa,Vernonia noveboracensis (Missouri); Viola cucullata , Viola canina , 
var. sylvestris (Golden, Colorado). 
