400 NORTH AMERICAN FLORA [VoLUME 7 
On AMMIACEAE: 
Neonelsonia ovata Coult. & Rose, Guatemala, 
Tyrg Locality; Volcan de Agua, Antigua, Guatemala, on Neonelsonia ovata. 
Distripurion: Known only from the. type locality. 
193. Dicaeoma Ortonii (H. S. Jackson) Arthur. 
Puccinia Ortonii H. S. Jackson, Brooklyn Bot. Gard. Mem. 1: 259. 1918. 
O. Pycnia epiphyllous, few, crowded in small groups 1~2 mm. in diameter, inconspicuous, 
light-brown, flattened-globoid, 128-175 by 95~115 yw; ostiolar filaments short, up to 50-65 
long, usually not projecting beyond the ostiole. 
I. Aecia chiefly hypophyllous, gregarious in rounded or elongate groups, 6-8 mm. 
across, short-cupulate, 0.2-0.3 mm. in diameter; peridium yellowish, the margin erose; peridial 
cells oblong or rhombic, 20-26 by 29-35 y, slightly overlapping, the outer wall 8-10 » thick, 
finely transversely striate, the inner wall 4-6 u thick, verrucose or slightly tuberculate; aecio- 
spores globoid or broadly ellipsoid, 18-19 by 19-24 uw; wall colorless, 1-1.5 » thick, very closely 
and finely verrucose. 
II. Uredinia amphigenous, scattered, round, 0.5—-1 mm. across, tardily naked, cinnamon- 
brown, cinereous when covered, ruptured epidermis conspicuous; urediniospores broadly 
ellipsoid or obovoid, 19-26 by 23-32 »; wall cinnamon-brown, 2~3 » thick, moderately, very 
minutely, and obscurely echinulate, the pores 3-5, scattered. 
III. Telia amphigenous, scattered, round, 0.2-1 mm. across, tardily naked, pulvinate, 
somewhat pulverulent, chestnut-brown, cinereous when covered, ruptured epidermis conspicu- 
ous; teliospores broadly and somewhat angularly ellipsoid, 18-26 by 30-42 y, rounded at both 
ends, slightly or not constricted at septum; wall chestnut-brown, 1.5-2.5 » thick, uniform or 
somewhat thickened into a hyaline papilla over germ-pore, smooth except for a few longitudinal 
lines of verrucose markings, the germ-pore of upper cell apical or occasionally displaced later- 
ally, the pore of lower cell varying in position from near the pedicel to septum; pedicel color- 
less, deciduous. 
On PRIMULACEAE: 
Dodecatheon alpinum (A. Gray) Greene, California. 
Dodecatheon Jeffreyi Moore, Alaska; British Columbia. 
Dodecatheon Hendersoni leplophyllum Suksd., Oregon. 
?Dodecatheon tetrandrum Suksd., Washington. 
TYPE LOCALITY: Mt. Eddy, Siskyou County, California, on Dodecatheon alpinum. 
DistRIBUTION: From southeastern Alaska to southern California in the mountains. 
Exsiccati: Barth. N. Am. Ured. 554, 1457; Sydow, Ured. 1774. 
194. Dicaeoma Gentianae (Strauss) Kuntze, Rev. 
Gen. 33: 468. 1898. 
Uredo Gentianae Strauss, Ann. Wett. Ges. 2: 102. 1810. 
Puccinia Gentianae Link, in Willd. Sp. Pl. 62: 73. 1825. 
Uromyces Gentianae Lév. Ann. Sci. Nat. III. 8: 371. 1847. 
QO. Pycnia amphigenous, few, scattered, punctiform, inconspicuous, honey-yellow be- 
coming brownish, flask-shaped, 80-128 u in diameter by 65~—96 u deep. 
J. Aecia amphigenous and caulicolous, chiefly hypophyllous, gregarious, crowded in 
groups, sometimes covering the entire under surface of the leaf, cupulate, short, 0.3-0.5 mm. 
broad; peridium whitish, the margin slightly recurved, irregularly lacerate; peridial cells linear- 
rhomboidal, 15-19 by 24-29 u, the outer wall about 3 » thick, smooth, the inner wall thicker, 
3-5 yw, closely verrucose; aeciospores angularly globoid or oblong, 13-19 by 16-24 »; wall pale 
lemon-yellow or colorless, irregular in thickness, 1—-1.5 », closely and finely verrucose. 
II. Uredinia mostly epiphyllous, numerous, scattered or grouped to form concentric 
circles 1.5-15 mm. in diameter, roundish or elliptic, about 0.5 mm. across, rather early 
naked, pulverulent, cinnamon-brown, ruptured epidermis conspicuous; urediniospores broadly 
ellipsoid or obovoid, 19-24 by 24-29 yp; wall golden- or cinnamon-brown, 1.5-2.5 » thick, 
moderately or sparsely and evenly echinulate, the pores 2, sometimes 3, approximately 
equatorial. 
Ill. Telia amphigenous, chiefly epiphyllous, scattered, roundish or often irregular, 
0.5-1.5 mm. across, early naked, compact, pulvinate, blackish-brown, ruptured epidermis 
