94 NORTH AMERICAN FLORA [VoLwME 7 
Silphium asperrimum Hook., Texas. 
Silphium Astleriscus L,., Louisiana. 
Silphium integrifolium Michx., Illinois, Mississippi. 
Silphium laciniatum U,., lowa, Kansas. 
Siiphium scaberrimum Ell., Texas. 
Silphium terebinthinaceum Jacq., Illinois, North Carolina. 
Stilphium trifoliatum 1,., Alabama. 
TYPE LOCALITY : North Carolina, on Silphium terebinthinaceum, 
DISTRIBUTION : Virginia to Iowa and Kansas, south to Alabama and central Mexico. 
21. Coleosporium arnicale Arthur, sp. nov. 
Oand I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, gregarious or scattered, large, 1 mm. or less in diameter, 
soon naked, orange-yellow, ruptured epidermis barely noticeable; urediniospores elliptical 
or globoid, 22-27 by 23-33; wall rather thick, 2-3, closely and finely verrucose with de- 
ciduous tubercles. 
III. Telia unknown. 
On CARDUACEAE : 
Arnica cana Greene, Washington. 
Type collected at Falcon Valley, Washington, October 30, 1901, 1’. WV. Suksdorf 644. 
22. Coleosporium paraphysatum Dietel & Holway, Bot. 
Gaz. 31: 337. 1901. 
O and I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, scattered irregularly, inconspicuous, small, 0.25 mm. across, 
early naked, ruptured epidermis inconspicuous; urediniospores obovate, or oblong-lanceo- 
late, 16-22 by 26-43; wall medium thick, 1.5-2.5, coarsely verrucose with low, flat and 
deciduous tubercles, 
III. Telia hypophyllous, scattered, small, 0.25 mm. across; teliospores with wall 
swelling 25-304 thick above; contents orange-yellow fading to colorless, oblong, 16-22 by 
48-65 u, rounded or truncate above, obtuse below. 
Ow CARDUACEAE : 
Liabum discolor Benth. & Hook., Jalisco. 
TYPE LOCALITY: Chapala, Mexico, on Liabum discolor 
DISTRIBUTION : Central Mexico. 
EXSICCATI: Sydow, Ured. 1540. 
23. Coleosporium occidentale Arthur, sp. nov. 
O and I. Pyecnia and aecia unknown. 
II. Uredinia hypophyllous, scattered, or somewhat gregarious, small, 0.25-0.5 mm. 
across, soon naked, yellow fading to nearly white, ruptured epidermis evident; ure- 
diniospores broadly ellipsoid, 16-22 by 25-33; wall medium thick, 1.5-2, evenly but not 
densely verrucose, with low papillae. 
III. Telia hypophyllous, scattered, small, about 0.25 mm. across, slightly raised, orange- 
yellow fading to pale-yellow ; teliospores with wall swelling 15-20 thick above; contents 
orange-yellow fading to nearly colorless, oblong or clavate-oblong, 17-20 by 50-72p, 
rounded or truncate above, rounded or obtuse below. 
On CARDUACEAE: . 
Senecio hydrophiloides Rydb., Washington. 
Type collected at Falcon Valley, Washington, July 17, 1900, W. N. Suksdorf 586. 
24. Coleosporium Senecionis (Schum.) Fries, Summa Veg. 
Seand. 512. 1849, 
Uredo farinosa 8 Senecionis Pers. Syn. Fung. 218. 1801. 
Uvedo Senecionis Schum, Enum. Pl. Saell. 2: 229. 1803. 
Caeoma Senecionis Schlecht. Fl. Berol. 2: 119. 1824. 
Peridermium oblongisporium Fuckel, Symb. Myc. 42. 1869. 
"©. Pycnia amphigenous, scattered, numerous, originating between mesophyl and cor- 
tical layer, noticeable, 0.2-0.3 mm. wide, 0.5-1 mm. long, dehiscent by a longitudinal slit, 
70-100 # high. 
