Part 3, 1912] ABCIDIACEAB 231 



20. Nigredo Polemonii (Peck) Arthur. 



Aeadium Polemonii Peck, Bot. Gaz. 4: 230. 1879. 

 Uromyces-acuminatus Arth. Bull. Minn. Acad. 22 : 35. 1883 

 Uromyces Spariinae Farl. Proc. Am. Acad. 18 : 77. 1883. 

 iAectdium Tissae Sllis & Bv. Bull. Torrey Club 24 : 284. 1897. 

 Caeomurus acuminatus Kuntze, Rev, Gen. 3^ : 449, 1898. 

 Caeomurus Spartinae Kuntze, Rev. Gen. 33 : 450. 1898. 

 Nigredo acuminata Arth. R6sult. Sci. Congr. Bot. Vienne 343. 1906. 



0. Pycnia chiefly epiphyllous, gregarious, in small groups 0.5-1.5 mm. across, not con- 

 spicuous, punctiform, honey-yellow becoming brownish, globoid, 80-160 ju in diameter by 

 70-150 M high ; ostiolar filaments 30-50 ju long. 



1. Aecia chiefly hypophyllous, gregarious, more or less crowded in groups 1-4 mm. 

 across, on slightly discolored spots, cupulate, short, 0.2-0.4 mm. in diameter ; peridium color- 

 less, the margin irregularly lacerate, slightly recurved ; peridial cells rhomboidal, 21-29 m 

 long, the outer wall transversely striate, 4-7 )Lt thick, smooth, the inner wall rather finely 

 verrucose, 2-4 m thick; aeciospores subgloboid, 15-24 by 18-27 m ; wall colorless, 1.5-2 /*, 

 evenly and finely verrucose. 



On Caryophyllaceae : 



Arenaria lateriflora I^., Nova Scotia. 



Tissa canadensis (Pers.) Britten {Spergularia canadensis G. Don), Nova Scotia. 



?Tissa macrolheca (Hornem.) Britton {Spergularia macroiheca Heynh.), California. 

 On Primulaceae : 



Steironema ciliatum (Iv.) Raf. {Lysimachia ciliata X,.), Colorado, Illinois, Iowa, Kansas, 



Nebraska, South Dakota, Wyoming. 

 Steironema Lunellii Greene, North Dakota. 

 On Polemoniaceae : 



Collomia linearis Nutt.,' Colorado, Nebraska, North Dakota. 



Phlox divaricala L., Iowa. 



Phlox paniculata L., Iowa. 



Phlox pilosa I^., South Dakota, Wisconsin. 



Polemonium reptans L,, Indiana, Iowa. 



II. Uredinia epiphyllous, scattered, intercostal, linear, 0.4-2 mm. or more long, rather 

 early naked, pulverulent, cinnamon-brown, ruptured epidermis conspicuous ; urediniospores 

 broadly ellipsoid, 19-27 by 25-37 ju; wall light cinnamon-brown, moderately thick, 2-3 m, 

 evenly and moderately echinulate, the pores about 8, scattered. 



III. Telia epiphyllous, scattered, intercostal, linear, 0.4-2 mm. or more long, rather 

 early naked, dark blackish-brown, ruptured epidermis conspicuous ; teliospores obovoid, 

 oblong-obovoid or ellipsoid, 15-24 by 23-39 /x, rounded, obtuse, or acuminate above, usually 

 narrowed below ; wall chestnut-brown, sometimes with a slightly paler umbo, often some- 

 what paler below, rather thin, 1-1.5 /*, much thicker above, 5-12 ju, smooth ; pedicel some- 

 what colored, concolorous, about length of spore. 



The species is composed of quite distinct races, partly made evident by cultures and partly 

 indicated by slight morphological characters. It has been found that the Atlantic coast form on 

 Spartina patens infects Tissa while that on .S". Mic hauxiana iniects Arenaria. A form on 5". 

 Michauxiana in the interior of the continent, usually with acuminate teliospores, infects Pole- 

 monium^ while a more common form of the interior on the same host, and also on ^. gracilis^ 

 usually with teliospores rounded above, infects Steironema. 



On Poaceae : 



Spartina glabra alternijlora (Loisel.) Merr. (S. alterniflora Loisel., S. stricta alterniflora 



A. Gray), Delaware, Florida, Massachusetts, New York; Nova Scotia. 

 Spartina gracilis Trin., North Dakota, Wyoming; Alberta. 

 Spartina Michauxiana Hitchc. {S . cynosuroides A. Gray, not Roth), Colorado, Illinois, 



Indiana, Iowa, Nebraska, North Dakota, Wisconsin ; Nova Scotia. 

 Spartina patens (Ait.) Muhl., Maine ; Nova Scotia. 



Spartina patens juncea (Michx.) Hitchc. {S.juncea Willd.), Massachusetts. 

 Type locality : Iowa, on Polemonium reptans. 



Distribution : Plains, Alberta to Kansas eastward to Wisconsin and Indiana, and along the 

 Atlantic coast from Nova Scotia to Florida, possibly also along the Pacific coast. 



Illustrations : Bot. Gaz: 34 : 5,/. la, *, c, d, e-; Bull. Lab. Nat. Hist. Univ. Iowa 5 : pi. 4,f. 



52a, b, c, d. 



Hxstccati: Ellis, N. Am. Fungi 239, 1008, 1424, 1443 ; Seym. & Ejarle, Econ. Fungi 67, 68, 



546- Sydow, Ured. 251; Rab.-Wint. Fungi ^m . 3623 , 3637 ; D. Griff. W. Am. Fungi 76,358; 

 Barth. Fungi Columb. 2288, 2490,2605 ; Brenckle, Fungi Dak. 70, 102, 134; Arth. & Holway, Ured. 

 Exs. Ic. 52a, b, c, d. 



