604 NORTH AMERICAN FLORA [VoLUME 7 
Arnica diversifolia Greene (A. latifolia viscidula A. Gray), California, Oregon. 
Arnica latifolia Bong., Montana. 
Arnica pedunculata Rydb., Utah. 
Arnica rhizomata A. Nelson, Utah. 
Arnica subplumosa Greene, Colorado, 
TYPE Locatity: Colorado, on Arnica cordifolia. 
DISTRIBUTION: Mountains of Colorado to central California, and northward to northwestern 
Montana and Oregon. 
Exsiccati: Clements, Crypt. Form. Colo. 546; Ellis & Ev. Fungi Columb. 1846; Garrett, 
Fungi Utah. 25, 26, 27; Sydow, Ured. 1906, 1907. 
42. Puccinia Trixitis (Kern & Kellerm.) Arth. Am. Jour. Bot. 5: 
534. 1918. 
Uredo Trixitis Kern & Kellerm. Jour. Myc. 13: 26. 1907 
II. Uredinia hypophyllous, scattered, round or oval, 0.3-1 mm. across, early naked, 
pulverulent, dark chestnut-brown, ruptured epidermis conspicuous; urediniospores globoid or 
broadly ellipsoid, 21-26 by 24-31 4; wall dark cinnamon- or light chestnut-brown, 1.5-3 » 
thick, sparsely or moderately echinulate, the pores 2, approximately equatorial. 
Tif. Telia hypophyllous, scattered, round or oval, 0.2-0.8 mm. across, early naked, 
compact, chestnut-brown, ruptured epidermis conspicuous; teliospores ellipsoid or oblong, 
16-21 by 29-45 uw, rounded above, slightly narrowed below, constricted at septum; wall 
cinnamon-brown, 1-2 » thick, thickened above, 4-7 », smooth; pedicel colorless, up to one 
and a half times length of spore. 
ON CARDUACEAE: 
Trixis frutescens P. Br., Guatemala. 
TYPE LOCALITY: San Lucas, Solola, Guatemala, on Trixis frutescens. 
DIstTRIBUTION: Central Guatemala. 
43. Puccinia Onopordi Sydow, Monog. Ured. 1: 128. 1902. 
II. Uredinia amphigenous and caulicolous, round or oval, small, 0.2-1 mm. across, some- 
what tardily naked, pulverulent, light cinnamon-brown, ruptured epidermis usually noticeable; 
urediniospores globoid or ellipsoid, 23-26 by 26-32 4; wall cinnamon-brown, 2 yw thick, rather 
closely and finely echinulate, the pores 3, approximately equatorial. 
III. Telia amphigenous and caulicolous, round or oval, small, 0.2-1 mm. across, somewhat 
tardily naked, pulvinate, becoming somewhat pulverulent, chestnut-brown, ruptured epidermis 
usually noticeable; teliospores broadly ellipsoid or oblong, 22-26 by 32-48 u, rounded above 
and below, slightly or not constricted at septum; wall thin, 1-1.5 4», dark cinnamon-brown, 
sometimes slightly thickened over pore of each cell, 3-4 u, very finely verrucose, appearing 
almost smooth when wet; pedicel colorless, fragile, equaling spore or shorter. 
On CaRDUACEAE: 
Onopordon Acanthium L,., Nova Scotia. 
TYPE LocaLiry: Aintab, Syria, on Onopordon Cardunculus. 
DIstTRIBUTION: Nova Scotia; also in southwestern Asia. 
DOUBTFUL OR EXCLUDED SPECIES 
Pucernta BuLLARIA Schw. Trans. Am. Phil. Soc. IT. 4: 296. 1832. (Not P. Bullaria 
Link, 1825.) This fungus is on Hyssopus nepetoides, and may be the early stage of some 
ascomycete. 
PUCCINIA FURFURACEA Ellis & Gall. Incidentally mentioned by Dietel (Hedwigia 37: 
202. 1898) as from Mexico; doubtless a hyponym. 
PUCCINIA INCARCERATA Lév., reported from Cuba, on petioles of Cissus, probably belongs 
to the Ustilaginaceae, and is usually recorded as Mycosyrinx Cisst (DC.) G. Beck. 
