iS) 
CO 
On 
JACKSON: UREDINALES OF OREGON 
same plants and even on the same leaves. Sydow (Ann. Myc. 1: 326. 
1903) described P. sejuncta on such a mixture. 
216. AECIDIUM DELPHINI Barth. Jour. Myc. 8: 173. 1902. 
Aecidium Batesianum Barth. in E. & E. Fungi Col. 1901. 1904. 
ON RANUNCULACEAE: 
Delphinium depauperatum Nutt.—Mary’s Peak, Benton Co., May 
21 kO05, 3210. 
Delphinium sp.—Corvallis, April 11, 1915, 2615; Redmond, 
Gxook €o:, 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 GRAEBNERIANUM Henn. Hedwigia 37: 273. 18098. 
Aecidium Alaskanum Trelease, Harr. Alaska Exp. 5: 37. 1904. 
On ORCHIDACEAE: 
Limnorchis dilatata (Pursh) Rydb.—Horse Lake, Cascade Mts., 
Aue, to00, 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 Engelmanui Parry—Whitman National Forest, Wallowa Co., 
Juty,,1913, J. R. Weir, 277. 
This species forms large witches’ brooms. 
219. PERIDERMIUM ORNAMENTALE Arth. Bull. Torrey Club 28: 665. 
19Ol. 
ON PINACEAE: 
. Abies concolor (Gord.) Parry 
J. R. Weir, 745. 
Abies nobilis Lind|.—Larch Mt., Multnomah Co., Aug., 1910, 3293. 
White Pine, Baker Co., June, 1913, 
220. Uredo Phoradendri sp. nov. 
O. Pycnia not seen. 
II. 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, 
