208 BROOKLYN BOTANIC GARDEN MEMOIRS 
This species has not previously been recorded on the latter host 
so far as the writer is aware. 
11. HyaALopsora Potypopit (DC.) Magn. Ber. Deuts. Bot. Ges. 19: 
hoe. TOOT. 
Uredo Polypodii DC. Fl. Fr. 6: 81. 1815. 
ON POLYPODIACEAE: 
Filix fragilis (L.) Underw.—Road to Lost Lake, Hood River Co., 
July 24, 1915, 3024. 
12. MELAMPSORA sp. 
Il. Uredinia amphigenous, chiefly epiphyllous, scattered or occa- 
sionally gregarious, round, 0.5-I1 mm., early naked, somewhat 
pulverulent, orange fading to yellowish, ruptured epidermis not con- 
spicuous;. uredospores ellipsoid or obovoid, 15-19 by 21-24 u, wall 
colorless, uniformly 2.5—3 uw in thickness, moderately to closely verru- 
cose-echinulate; paraphyses numerous, chiefly peripheral, clavate or 
occasionally capitate, 18-26 by 45-70 yu, wall colorless, usually uni- 
formly 1-2 wu thick, occasionally thickened at apex to 4 up. 
ON SALICACEAE: 
Populus alba .—Sheridan, Yamhill Co., July 7, 1914, He Pe 
Barss, 1935; Cottage Grove, Lane Co., July 17, 1914, 1033; Phuilo- 
math, July 20, 1915, 3300. 
The only other American collection on this host known to the 
writer is one in the Arthur herbarium, collected by E. Bethel, Aug. 7, 
1913, at San Jose, Cal. These specimens differ from all other North 
American collections on Populus. It seems most probable that this 
is an introduced European species. Only uredinia are present in 
American collections and it is quite impossible to assign it to any 
known species without telial material. A description of the uredinial 
stage drawn up from the Oregon collections is given for the benefit 
of those who may have occasion to study this form. 
The Oregon collections were all made from low, rapidly growing 
water sprouts. 
13. MELAMPSORA ALBERTENSIS Arth. Bull. Torrey Club 33: 517. 
1906. 
Caeoma occidentalis Arth. Bull. Torrey Club 34: 591. 1907. 
On PiNACESE: I. 
Pseudotsuga mucronata (Raf.) Suds.—Southeast Mt. Jefferson, 
Linn Co., July 3, 1914, i: DL Bailey,.z2541; Sumpter, BakersGe; 
July,.20, 1913, |. Re Weu2754 1 Convallis, June. too: 
The life history of this species has been studied by Arthur (Myco- 
logia 4: 29 and 59, 1912), who obtained infection resulting in pycnia 
