Part 4, 1920] AECIDIACEAE 299 
Vasiee sessilifolia (Baker) Greene (Smilacina sessilifolia Nutt.), Washington. 
agnera stellata (L.) Morong (Smilacina stellata Desf.), Idaho, Nebraska, North Dakota; 
British Columbia, Manitoba, Ontario. 
ON IRIDACEAE: 
Tris Va Wesoiie one ie Massachusetts, Michigan, Minnesota, Nebraska, New 
II. Uredinia amphigenous, scattered, narrowly oblong or linear, 0.5—0.8 mm. long, early 
naked, somewhat pulverulent, ciunamon-brown, opening by a longitudinal slit, ruptured 
epidermis evident; urediniospores ellipsoid, 19-26 by 24-34 yu; wall golden- to cinnamon-brown, 
moderately thin, 1.5-2 y, finely and moderately echinulate, the pores about 8, scattered. 
III. Telia amphigenous, scattered, sometimes confluent in long lines on the sheaths, 
oblong-linear, 0.5-2 mm. long, grayish-black, long covered by the epidermis; teliospores ob= 
long or oblong-clavate, 19-26 by 35-55 u, rounded or more often truncate above, usually 
narrowed below, slightly or not constricted at septum; wall smooth, thin, about 1.5 u, chestnut- 
brown, somewhat darker and thicker above, 3-5 u; pedicel tinted, short, usually deciduous. 
The species in Europe is composed of many well defined races (ef. Kleb. Wirtsw. Rostp. 
263-272. 1903), and in North America appears to have similar but different races, although 
too few cultures have yet been made to indicate clearly the true situation. 
On PoackaE: 
Phalaris angusta Nees, Oklahoma. 
Phalaris arundinacea L., Colorado, Indiana, Iowa, Michigan, Montana, New York, Oregon, 
South Dakota, Wisconsin, Wyoming; Manitoba, Ontario. : 
Phalaris californica H. & A. (P. amethystina Thurber, not Trin.), California. 
Phalaris canariensis L., California. 
Phalaris minor Retz., California. 
TYPE LocaLity: Island of Zealand, Denmark, on Convallaria bifolia. 
DistriBution: Nova Scotia westward to Manitoba and Oregon, and southward to Alabama 
and Texas; also in Europe and Japan. 
Intustrarions: Bull. Lab. Nat. Hist. Univ. Iowa 5: ol. 4, f. 44a, b; Zeits. Pllanzenkr. 2: fl. 5, 
f. 10a, b; Briosi & Cavara, Funghi Par. 285. 
Exsiccati: Arth. & Holway, Ured. Exs. Ic. 44a, b; Barth. Fungi Columb. 2203, 3571, 4273, 
4370; Barth. N. Am. Ured. 567, 1075; D. Griff. W. Am. Fungi 26, 26a, 6; Ellis, N. Am. Fungi 229, 
1014, 1421, 1475; Rab.-Wint. Fungi Eur. 2927, 3026a; Roum. Fungi Sel. 4824, 4917; Sydow, Ured. 
1781, 2429; Thiim. Myc. Univ. 1433, 1519. 
38. Dicaeoma unicum (Holway) Arthur & Fromme. 
Puccinia unica Holway; Arth. & Fromme, Torreya 15: 263. 1915. 
O and I. Pyecnia and aecia unknown. 
II. Uredinia not seen; urediniospores intermixed with the teliospores; uredinial para- 
physes numerous, intermixed, capitate, 13-18 u broad above, up to 60 » long, the wall colorless 
or golden-brown, about 7 » thick above, narrowing abruptly to about 2 » in the pedicel which 
is often solid and concolorous; urediniospores ellipsoid, 19-24 by 24-29 y; wall cinnamon- 
brown, 1.5~—2 uw, inconspicuously and rather closely echinulate, the pores 4 or 5, approximately 
eqttatorial. 
III. Telia culmicolous and epiphyllous, crowded and often confluent in lines, elliptic or 
oblong-linear, 0.5-2 mm. long, early naked, pulvinate, blackish-brown, ruptured epidermis 
inconspicuous; teliospores ellipsoid, 21-26 by 29-39 », rounded at both ends, slightly or not 
constricted at septum; wall dark chestnut-brown, smooth, 2-3 » thick, slightly thickened at 
apex, up to 6 uw; pedicel colorless, twice length of spore or more. 
On POACEAE: 
Aristida longiramea Presl, Morelos. 
Tyre LocaLity: Cuernavaca, Morelos, on Aristida longiramea. 
DistTRIBUTION: Known only from the type locality. 
39. Dicaeoma interveniens (Peck) Arthur & Fromme. 
Roestelia interveniens Peck, Bull. Torrey Club 10: 74, 1883. 
Aecidium roestelioides Ellis & Ev. Jour. Myc. 1: 93. 1885. 
Aecidium Malvastri P. Henn. Hedwigia 36: 216. 1897. 
Puccinia Burnettii D. Griff. Bull. Torrey Club 29: 298. 1902. 
Aecidium interveniens Farl. Bibl. Index N. Am. Fungi 1:58. 1905. 
Dicaecoma Burnettii Arth. Résult. Sci. Congr. Bot. Vienne 344. 1906. 
Puccinia interveniens Bethel; Blasdale, Univ. Calif. Publ. Bot. 7:119. 1919. 
