JACKSON: UREDINALES OF OREGON 207 



Cronartium Comandrae Peck, Bull. Torrey Club ii: 50. 1884. 



Peridermium Betheli Hedge. & Long, Phytopath. 3: 251. 1913. 

 On Pinaceae: I. 



Finns ponderosa Dougl. — Hood River Co., May 10, 1910, 3333; 

 Sumpter, Baker Co., May, 1916, J. R. Weir. 

 On Santalaceae: H, HI. 



Comandra umhellata (L.) Nutt. — Corvallis, June 20, 1909, E. R. 

 Lake, 3068, July 24, 1914, 2510, Road to Ashland toll house, Jackson 

 Co., Sept. 27, 1913, E. P. Meinecke, Cr D 23; Hood River Co., June 

 20, 1914, 1995, July 22, 1915, 3143; Dufur, Wasco Co., June 30, 1914, 

 1337; Indian Creek, Malheur Co., Sept. 16, 1897, E. P. Sheldon, 8934. 



The collection of aecia on Piniis ponderosa made at Hood River 

 consisted of a large fusiform gall at the base of the trunk of a young 

 tree about 2 inches in diameter. The gall entirely encircled the tree 

 which was noticeably stunted from the effects of the parasite. The 

 foliage also showed a distinct yellow cast. 



The life history of this common and widespread species was first 

 demonstrated by Hedgcock and Long (1. c). They succeeded in 

 obtaining the development of uredinia on Comandra umhellata by 

 exposing them to infection from aecia on Finns ponderosa collected in 

 Washington and California and on Finus pungens from Pennsylvania. 

 In a later publication the authors (Bull. U. S. Dept. Agr. 247: 1-20. 

 1915) discuss the economic importance of this fungus as a disease of 

 pines and record in detail the results of extensive culture work. 



9. Hyalopsora Aspidiotus (Peck) Magn. Ber. Deuts. Bot. Ges. 19: 



582. 1901. 



Uredo Aspidiotus Pk. Ann. Rept. N. Y. State Mus. 24: 88. 1872. 

 On Polypodiaceae : 



Phegopteris Dryopteris (L.) Fee — Austin, Grant Co., Aug. 1915, 

 J. R. Weir, 164. 



10. Hyalopsora laeviuscula (D. & H.) Arth. North Am. Flora 7: 



113. 1907. 



Uredo laeviuscida Dietel & Holway, Erythea 2: 127. 1894. 

 On Polypodiaceae: 



Folypodium occidentale (Hook.) Maxon — Vicinity of Mt. Jefferson, 

 July 27, 1907, E. R. Lake, 2508; Corvallis, March 25, 1915, G. B. 

 Posey, 2626; Hood River Co., May 16, 1915, 3042; Bridal Veil, 

 Multnomah Co., May 18, 1915, 3025. 



Folystichum munitum (Kaulf.) Presl., Mary's Peak, Benton Co., 

 Apr. 23, 1915, G. B. Posey, 3041. 



The urediniospores in this species are smooth in all collections as 

 shown by very careful examination with the oil immersion objective. 



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