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IOWA ACADEMY OF SCIENCE Voe. XXIX, 1922 
soil rather dry. We have it in the collection from the following 
points. 
No label (probably California) (C. C. Parry) 
Yosemite Valley, Yosemite Falls (L. H. Pammel) 
North Pacific Coast Flora (C. C. Parry) 
San Diego, California, Mexican Boundary Survey (C. C. 
Parry) 
lone, California (C. C. Parry) 
var. ilicifolia Kellogg of R. insulis Kellogg 
Southern California No. 41 (Parry and Lemmon, 1876) 
Fall Brook (C. C. Parry) 
CROWNED RUST AND RHAMNUS 
I was requested by Dr. I E. Melhus to look for species of 
Rhamnus and the uredo spores of Puccinia coronata, especially 
on Lolium perenne, Holcus lanatus and other grasses on which 
it occurs. The perennial rye grass was rather common in the 
Rio Grande Valley, Fort Bayard, New Mexico, land at San Diego, 
Los Angeles, Patterson, Yosemite, Wawona, Berkeley and Sacra- 
mento, California. The Holcus lanatus is a common grass in 
clearings and meadows in the Sierra Mountains of California. 
Thus it occurs in the Yosemite Valley at Blairsden and Wawona. 
Velvet grass is one of the common meadow grasses of the moun- 
tain region. The time of my visit was in August, naturally dry 
and in places where irrigation was practiced, I expected to find 
some form of Puccinia coronata . It was, however, rare. I ex- 
amined thousands of leaves of this grass, but in no case except at 
Wawona did I find any Puccinia coronata. Wawona is on a 
branch of the Merced River and the plot of grass where I found 
uredo spores was irrigated. Here the rust was fairly common 
on the leaves of Holcus lanatus. There were some Rhamnus 
Californica near it. I should judge therefore, that Holcus is not 
a favorable host of the infection of the rust from Rhamnus Cali- 
fornica in California. How common the aeeial stage may be on 
the Rhamnus Californica I do not know. One would expect to 
find the Puccinia coronata on the introduced species of the A. 
fatua and its variety as well as on A. barb at a the two wild species 
of oats of California, but I did not find any of the teleutospores 
though these grasses are common in many parts of California, 
like Berkelely, Los Angeles, Patterson, Merced Falls and San 
Diego. I also observed numerous young green leaves of Avena 
fatua along irrigation ditches but no rust infection. 
Department oe Botany, 
Iowa State College 
