208 BROOKLYN BOTANIC GARDEN MEMOIRS 



This species has not previously been recorded on the latter host 

 so far as the writer is aware. 



11. Hyalopsora Polypodii (DC.) Magn. Ber. Deuts. Bot. Ges. 19: 



582. 1901. 



Uredo Polypodii DC. Fl. Fr. 6: 81. 1815. 

 On Polypodiaceae : 



Filix fragilis (L.) Underw. — Road to Lost Lake, Hood River Co., 

 July 24, 1915, J024. 



12. Melampsora sp. 



IL Uredinia amphigenous, chiefly epiphyllous, scattered or occa- 

 sionally gregarious, round, 0.5-1 mm., early naked, somewhat 

 pulverulent, orange fading to yellowish, ruptured epidermis not con- 

 spicuous; uredospores ellipsoid or obovoid, 15-19 by 21-24 /x, wall 

 colorless, uniformly 2.5-3 ii in thickness, moderately to closely verru- 

 cose-echinulate; paraphyses numerous, chiefly peripheral, clavate or 

 occasionally capitate, 18-26 by 45-70 jx, wall colorless, usually uni- 

 formly 1-2 ii thick, occasionally thickened at apex to 4 m- 

 On Salicaceae: 



Popuhis alba L. — Sheridan, Yamhill Co., July 7, 1914, H. P. 

 Barss, IQJS; Cottage Grove, Lane Co., July 17, 1914, IQ33; Philo- 

 math, July 20, 1915, 3309. 



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 Popuhis. 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 Pinaceae: L 



Pseudotsuga mucronata (Raf.) Suds. ^Southeast Mt. Jefferson, 

 Linn Co., July 3, 1914, F. D. Bailey, 1841; Sumpter, Baker Co., 

 July 20, 1913, J. R. Weir, 27s; Corvallis, June 1910. 



The life history of this species has been studied by Arthur (Myco- 

 logia 4: 29 and 59, 1912), who obtained infection resulting in pycnia 



