36 Department Circular 195, U. S. Dept. of Agriculture. 



642. P. silphi S. — III, on Silphium 



perfoUatum. 

 Fargo, N. Dak., July 22, 1914, 

 J. F. Brenckle. Dupl. F. Dak. 

 262. 



643. P. simplex Eriks. and Henn. — 



III, on Hordeum jubatum. 

 Aberdeen, S. Dak., July, 1896, 



D. Griffiths. 



644. P. smilacis S. — II and III, on 



Smilax sp. 

 Starkville, Miss., Nov. 3, 1893, 

 S. M. Tracy. 



645. P. smilacis S. — II and III, on 



Smilax bona-nox. 

 Spiro, Okla., Oct. 21, 1913, E. 

 Bartholomew. Dupl. N. A. Ured. 

 968. 



646. P. smilacis S.— II and III, on 



Smilax glauca. 

 Orange Bend, Fla., Mar. 27, 

 1891, L. M. Underwood. 



647. P. smilacis S. — II and III, on 



Smilax glauca. 

 Camp Pike, Ark., Oct. 1, 1918, 

 J. F. Brenckle. 



648. P. smilacis S. — III, on Smilax 



rotundifolia (?). 

 Takoma Park, D. C, Nov. 10, 

 1901, H. J. Webber. 



649. P. sorghi S. — I, on Oxalis stricta. 



Hoxie, Kans., June 24, 1907, 



E. Bartholomew. 



650. P. sorghi S. III, on Zea mays. 



Champaign, 111., Sept. 19, 1889, 

 M. B. Waite. 



651. P. sorghi S. — II, on Zea mays. 



Colby, Kans., Sept. 13, 1906, 

 E. Bartholomew. 



652. P. sorghi S. — III, on Zea mays. 



Bethel, Vt, Oct. 10, 1906, P. 

 Spaulding. 



653. P. sporoboli Arth. — III, on Sporo- 



■ bolus heterolepis. 

 Dickey County, N. Dak., Mar., 

 1916, J. F. Brenckle. 



654. P. sporoboli Arth. — III, on 



Sporobolus heterolepis. 

 Bridge Gully, Dickey County, 

 N. Dak., Sept. 10, 1916, J. F. 

 Brenckle. 



655. P. stipae Arth. — I, on Solidago 



mtesouriensis. 

 Near Kulm, N. Dak., June 5, 



1912, J. F. Brenckle. Dupl. F. 

 Dak. 188. * 



656. P. stipae Arth.— Ill, on Stipa 



comata. 

 Sandcoulee, Mont., Aug. 26, 



1888, F. W. Anderson. 



657. P. striatula Pk. — III, on Calama- 



grostis canadensis. 

 Spooner, Wis., Sept. 24, 1912, 

 J. J. Davis. 



658. P. suaveolens Rostr. — II and III, 



on Cirsium arvense. 

 New Brunswick, N. J., May 

 21, 1889, D. G. Fairchild. 



659. P. suaveolens Rostr. — II, on 



Cirsium arvense. 

 New Brunswick, N. J., June, 



1889, D. G. Fairchild. 



660. P. suaveolens Rostr. — III, on 



Cirsium arvense 

 Orono, Me., Oct. 17, 1900, P. L. 

 Ricker. 



661. P. suaveolens Rostr. — II, on Cir- 



sium arvense. 

 Niagara Falls, N. Y., July 15, 



1913, E. Bartholomew and Mrs. 

 J. D. Fink. Dupl. F. Col. 4155 ; 

 N. A. Ured. 1664 and 1957. 



662. P. subcircinata Ell. and Ev. — 



III, on Senecio perplexus 

 dispar. 

 Fort Douglas, Utah, May 20, 

 1918, J. F. Brenckle. 



663. P. subnitens Diet. — I, on Cheno- 



podium album. 

 Callaway, Nebr., May 7, 1901, 

 J. M. Bates. Dupl. F. Col. 1501. 



664. P. subnitens Diet. — II and III, 



on Distichlis spicata. 

 Billings, Mont., Sept. 4, 1884, 

 comm. A. B. Seymour. 



665. P. subnitens Diet. — III, on Dis- 



tichlis spicata. 

 Helena, Mont., Oct., 1888, 

 F. W. Anderson. Dupl. 1902 

 Myc. Ex. 68 as P. distichlidis. 



