JACKSON: UREDINALES OF OREGON 225 



Posey, 13Q4; Whitewater Ranger station, Aug. 28, 1916, H. P. Barss; 

 Foot of Mt. Jefferson, Aug. 28, 1916, H. P. Barss. 



The material collected by Barss and Posey in 1914 contained 

 teliospores in the uredinia and forms the basis of the transfer of the 

 very interesting and much discussed Uredo nootkatensis to Gymno- 

 sporangium. A full account of the history of this species has been 

 given by Arthur (1. c). In the collections of 1916 made in the same 

 locality by Prof. Barss, teliospores were found in great abundance 

 with the uredinia, and in many sori predominated. The uredinio- 

 spores were germinated in this laboratory and the germ tubes found to 

 develop in the usual way for urediniospores. 



43. Gymnosporangium Sorbi (Arth.) Kern, Bull. N. Y. Bot. Gard. 7: 



438. 191 1. 



Aecidium Sorbi Arth. Bull. Torrey Club 33: 521. 1906. 

 On Malaceae: I. 



Sorbiis occidentalis (S. Wats.) Greene — ^Whitewater Ranger station, 

 Mt. Jefferson, Aug. 28, 1916, H. P. Barss. 



There is little doubt that the suggestion of the genetic relationship 

 of this species with Gymnosporangium nootkatensis (cf. 42) originally 

 made by Kern (Science 31: 833. 1910) and later re-affirmed by 

 Arthur (Am. Jour. Bot. 3: 43-44. 1916) will prove to be correct. 

 The above collection extends the range of the aecia to correspond 

 exactly with the range of the known collections of uredinia and is the 

 most southern record. 



It seems best, however, for the purpose of this list to retain the 

 above name till actual cultures confirming the prediction have been 

 made. 



44. Gymnosporangium tubulatum Kern, Bull. N. Y. Bot. Gard. 7: 



451. 1911. 



Roestelia tubulata Kern; in M. E. Jones, Bull. Univ. Mont. 61: 64. 

 1910. 

 On Malaceae: I. 



Crataegus Douglasii Lindl. — Minam River, Wallowa Co., Oct. 5, 

 1897, E. P. Sheldon, go6i; Wallowa Nat. Forest, Sept. 28, 1910, 

 G. G. Hedgcock, 1944. 



The above collections were found in the Arthur herbarium at the 

 Purdue University Experiment Station. The specimens show chiefly 

 foliage infection, though the first-mentioned collection also includes 

 infected fruit. 



•Weir (Phytopath. 5: 218. 1915) has recently demonstrated by 

 cultures that the telia, which were previously unknown, occur on the 

 twigs of Juniperus scopulorum forming irregularly lobed galls. Telia 



