Garrett: Smuts and Rusts of Utah 



107 



153. Gymnosporangium inconspicuum Kern 



On Jnniperus utahensis (Engelm.) Lemmon : 2641, July 17, 1920, Maple 

 Canyon branch of Cedar Canyon, about five miles from Cedar City, Iron Co. 

 The entire tree was covered with brown smears at and near the tips of the 

 branchlets. 2700, July 29, 1920, Parowan Main Canyon, opposite Second Left- 

 hand Fork. The branchlets covered with this rust (both in this collection, 

 and No. 2641 above) seemed to be dead or dying. 



On Amelanchier utahensis Koehne : 2643, I, July 16, 1920, Maple Canyon 

 branch Cedar Canyon, about five miles from Cedar City, Iron Co. The infec- 

 tion was so heavy on the Amelanchiers of the region that scarcely a fruit 

 could be found- not affected by the rust. 2674, July 22, 1920, Zion National 

 Park, near Wiley Camp, Washington Co. All of the fruits of all of the trees 

 in the canyon seemed to be affected. 2704a, July 30, 1920, First Left-hand 

 could be found not affected by the rust. 2674, July 22, 1920, Zion National 

 Fork Parowan Canyon, near Parowan, Iron Co. 2725, I, Aug. 7, 1920, Fill- 

 more, Millard Co. The peridia are beautifully developed in this collection. 

 Rust determined by Dr. Arthur. 



On Amelanchier prunifolia Greene: 2669a, I, July 22, 1920, Zion National 

 Park, above Wiley Camp, Washington Co. 



On Amelanchier Jonesiana C. K. Schneider: 2701, I, July 29, 1920, Paro- 

 wan Main Canyon, near Parowan, Iron Co. Host determined tentatively by 

 Dr. Rydberg. 



All of the above aecial forms are on the fruit. 



The canyons of southwestern Utah are surely a paradise for the collector 

 of the Gymnosperms. Indeed, they are present in such profusion, and on such 

 a variety of hosts, as to offer a very considerable puzzle to the collector who 

 attempts to keep the species separated. 



154 Melampsora albertensis Arth. I 



Caeoma occidentalis Arth. 



On Pseudotsuga mucronata (Raf.) Sudw. : 2685, July 27, 1920, Coal Creek 

 Canyon branch of Cedar Canyon, about fourteen miles from Cedar City, Iron 

 Co. This is the first recorded collection of this Caeoma for Utah, although 

 the Melampsora on Populus tremnloides has been reported from San Juan Co. 



164. PUCCINIA GRINDELIAE Peck 



On Chrysopsis horrida Rydb. ? : 2676, July 22, 1920, Zion Canyon, Washing- 

 ton Co. 



181. Uromyces oblongus Vize 



Three collections of this rust were made : 2679, July 22, 1920, Zion Can- 

 yon, Washington Co.; on Trifolium Kingii S. Wats.: 2686, July 27, Coal Creek 

 branch Cedar Canyon, Iron Co.; and 2706, July 30, 1920, First Left-hand Fork 

 Parowan Canyon, Iron Co. The rust was abundant ; but with the exception 

 of No. 2686 the Trifolium plants were too old to be determined. 



