JACKSON: UREDINALES OF OREGON 285 



same plants and even on the same leaves. Sydow (Ann. Myc. i : 326. 

 1903) described P. sejuncta on such a mixture. 



216. Aecidium Delphinii Barth. Jour. Myc. 8: 173. 1902. 

 Aecidium Batesianum Barth. in E. & E. Fungi Col. 1901. 1904. 



On Ranunculaceae : 



Delphinium depaiiperatiiyn Nutt. — Mary's Peak, Benton Co., May 

 21, 1915, J2I(5. 



Delphinium sp. — Corvallis, April 11, 1915, 2615; Redmond, 

 Crook Co., May 15, 1915,3327. 



This species is possibly identical with aecia on other Ranuncu- 

 laceous hosts referred to P. Clematidis (cf. 85). For purposes of this 

 list it is retained as a separate form as no cultures have been conducted. 



217. Aecidium Graebneriaxum Henn. Hedwigia 37: 273. 1898. 

 Aecidium Alaskanum Trelease, Harr. Alaska Exp. 5: 37. 1904. 



On Orchidaceae: 



Limnorchis dilatata (Pursh) Rydb. — Horse Lake, Cascade Mts., 

 Aug., 1909, J. C. Bridwell, 3322. 



This unconnected Aecidium is doubtless heteroecious since no 

 other stages have been found following the aecia on any of the col- 

 lections examined. The species is known otherwise only from Alaska 

 and in the mountains of British Columbia, Montana and California. 



218. Peridermium Coloradense (Diet.) Arth. & Kern, Bull. Torrey 



Club 33: 426. 1906. 

 On Pinaceae: 



Picea Engelmanii Parry — Whitman National Forest, Wallowa Co., 

 July, 1913, J. R. Weir, 277. 



This species forms large witches' brooms. 



219. Peridermium ornamentale Arth. Bull. Torrey Club 28: 665. 



1901. 

 On Pinaceae: 



Abies concolor (Gord.) Parry — ^White Pine, Baker Co., June, 1913, 

 J. R. Weir, 145. 



Abies nobilis Lindl. — Larch Mt., Multnomah Co., Aug., 1910, 32Q3. 



220. Uredo Phoradendri sp. nov. 

 O. Pycnia not seen. 



n. Uredinia amphigenous, gregarious, not crowded, spots not 

 conspicuous, punctate; rounded or slightly elongated, 0.4-0.8 mm. 

 across, tardily naked, somewhat pulverulent, bright orange, dehiscent 

 by an elongate or irregular fissure of the epidermis, ruptured epidermis 

 conspicuous and persistent; peridium membranous, at first hemi- 

 spherical, remaining closely adherent to the ruptured epidermis. 



