320 NORTH AMERICAN FLORA [VoLumE 7 
66. Dicaeoma vexans (Farl.) Kuntze, Rev. Gen. 33: 471. 1898. 
Uromyces Brandegei Peck, Bot. Gaz. 4: 127, 1879. Not Dicaeoma Brandegei Kuntze, 1898. 
Puccinia vexans Parl. Proc. Am. Acad. 18: 82. 1883. 
O and I. Pycnia and aecia unknown. 
II. Uredinia amphigenous, oval or oblong, scattered, cinnamon-brown, pulverulent, 
ruptured epidermis inconspicuous; urediniospores globoid or ellipsoid, 24-29 by 26-34 wu; wall 
yellow or light cinnamon-brown, uniformly thick, 2-3 », moderately and finely echinulate, the 
pores 8, scattered; amphispores numerous, globoid or broadly ellipsoid, 26-35 by 34-42 u, the 
wall thick, 3-4 y, greatly thickened above, up to 12 4, dark chestnut-brown, moderately and 
closely verrucose, the pores 3 or 4, equatorial, the pedicel long, up to 100 y, colorless, mostly 
persistent. 
IIl. Telia amphigenous, scattered, numerous, ovate or oblong, 0.5-1.5 mm. long, early 
naked, pulvinate, dark chocolate-brown, ruptured epidermis inconspicuous; teliospores broadly 
ellipsoid, 23~29 by 32-40 uw, rounded at both ends, or somewhat narrowed below, slightly or 
not constricted at septum; wall dark chestnut-brown, 2.5-3 u thick, 6-8 » thick above; pedicel 
colorless, as long as spore. 
ON POACEAE: 
Bouteloua aristidoides (H.B.K.) Griseb., Chihuahua. 
Bouteloua curtipendula (Michx.) Torr. (B. racemosa Lag., Atheropogon curtipendulus Fourn.), 
Arizona, Colorado, Indiana, Iowa, Kansas, Mississippi, Nebraska, New Mexico, 
North Dakota, Oklahoma, South Dakota, Texas; Hidalgo, Zacatecas. 
Bouteloua ramosea Scribn., Chihuahua. 
Type LocALIty: Colorado, on Bouteloua curtipendula. 
DISTRIBUTION: North Dakota southward to central Mexico, and from the foothills of the 
Rocky mountains eastward to central Indiana. 
InLusrrations: Bull. Lab. Nat. Hist. Univ. Iowa 5: pl. 8, f. 58a-e; Bull. Torrey Club 32: 
37, f. 1; Freeman, Minn. Pl. Diseases 165, f. 77; Jour. Appl. Micr. 5: 1656, f. 3. 
Exsiccati: Arth. & Holway, Ured. Exs. Ic. 58a—e; Barth. Fungi Columb. 3575, 4167; Barth. 
N. Am. Ured. 72, 579, 773; Brenckle, Fungi Dak. 17; Ellis, N. Am. Fungi 1051; Ellis & Ev. Fungi Co- 
lumb, 487, 1183, 1283; Ellis & Ev. N. Am. Fungi 3573; D. Griff. W. Am. Fungi 85, 253; Seym. & Earle, 
Econ. Fungi 532a, b; Sydow, Ured. 1086, 2280, 2436. 
67. Dicaeoma Jamesianum (Peck) Arth. Résult. Sci. Congr. Bot. 
Vienne 344. 1906. 
Aecidium Brandegei Peck, Bot. Gaz. 3:34. 1878. Not Dicaecoma Brandegei Kuntze, 1898. 
Aecidium Jamesianum Peck, Bot. Gaz. 5:34. 1880. 
Puccinia Bartholomaei Dietel, Hedwigia 31: 290. 1892. 
Dicaeoma Bartholomaei Kuntze, Rev. Gen. 33: 468. 1898. 
Puccinia Jamesiana Arth. Bot. Gaz. 35:18. 1903. 
Puccinia Diplachnis Arth. Bull. Torrey Club 31:4. 1904. 
Dicaeoma Diplachnis Arth. Résult. Sci. Congr. Bot. Vienne 344. 1906. 
O. Pycnia amphigenous, in circular groups, or distributed over large areas, honey-yellow, 
becoming brownish, immersed, flattened-globoid, 112-160 » broad by 95-128 u high; ostiolar 
filaments 20-35 » long. 
I. Aecia amphigenous and caulicolous, in circular groups 2-5 mm. in diameter, on dis- 
colored spots, sometimes so abundant as to appear to be distributed over large areas, cupulate 
or cylindric, 0.2-0.3 mm. in diameter, sometimes up to 1 mm. in length, usually much shorter; 
peridium colorless, the margin finely and evenly erose and somewhat recurved; peridial cells 
thomboidal or lenticular, 18-26 by 30-45 y, the outer wall smooth, 7-10 » thick, transversely 
striate, the inner wall coarsely verrucose, 3-7 » thick; aeciospores globoid or ellipsoid, 16-23 
by 18-26 yu; wall colorless, 2~3 » thick, much thickened above, 7-10 uw, closely and finely ver- 
rucose. 
On ASCLEPIADACEAE: . 
Acerates floridana (Lam.) Hitche. (A. longifolia Ell., Asclepies floridana Lam.), South 
Dakota, Wisconsin. 
Acerates viridiflora Ell. (Asclepias viridiflora Raf.), Kansas, Nebraska. 
Asclepias arenaria Torr., Nebraska, Texas. . 
Asclepias brachystephane Engelm., Arizona, New Mexico. 
Asclepias galioides H.B.K., New Mexico. : 
Asclepias latifolia (Torr.) Raf. (A. Jamesti Torr.), New Mexico. 
Asclepias macroura A. Gray, Jalisco. 
Asclepias ovalifolia Decaisne, North Dakota. 
Asclepias pumila (A. Gray) Vail (A. verticilleta pumila A. Gray), Arizona, Kansas, Nebraska, 
South Dakota, Texas. 
