Part 5, 1920] AECIDIACEAE 389 
177. Dicaeoma (?) tardissimum (Garrett) Arthur. 
Puccinia tardissima Garrett, Mycologia 6: 251. 1914. 
O and I. Pycnia and aecia unknown. 
II. Uredinia caulicolous and amphigenous, numerous, scattered, oblong, 0.2-0.5 by 0.4- 
1.5 mm., rather early naked, pulverulent, cinnamon-brown, ruptured epidermis conspicuous; 
paraphysis-like structures resembling urediniospores also sometimes present; urediniospores 
ellipsoid, obovoid or globoid, 18-23 by 20-26 yu; wall golden-brown, 1-2 u thick, finely echinu- 
late, the pores rather uncertain, usually 3 or 4, approximately equatorial, sometimes apparently 
3-6, scattered. 
III. Telia caulicolous or amphigenous, few, scattered, oblong, 0.2-0.5 mm. in diameter, 
rather early naked, chocolate-brown, ruptured epidermis noticeable; teliospores ellipsoid, 
18-24 by 26-35 uw, rounded at the ends, slightly constricted at septum; wall chestnut-brown, 
1.5-2.5 » thick, uniform, smooth; pedicel colorless, fragile. , 
On ALSINACEAE: 
Arenaria Burkei Howell (A. congesta subcongesta S. Wats.), Colorado. 
Arenaria congesta Nutt., Colorado, Wyoming. 
Arenaria Fendlerit A. Gray, New Mexico. 
Arenaria laxiflora Rydb., Colorado. 
Arenaria sp., Utah. 
Tyre Locality: Wasatch Mountains, Utah, on Arenaria sp. 
DIstRIBuTION: The central Rocky Mountain region. 
Exsiccat1: Barth. N. Am. Ured. 1176; Garrett, Fungi Utah. 242. 
178. Dicaeoma Calthae (Grev.) Kuntze, Rev. Gen. 
33: 468. 1898. 
Aecidium Calthaee Grev. Fi. Edin. 446. 1824. 
Puccinia Calthae Link, in Willd. Sp. Pl. 62:79. 1825. 
Uredo Calthae Rab. Deutschl. Krypt.-Fl. 1:5. 1844. 
Puccinia elongata Schroet. Beitr. Biol. Pf. 3:61. 1879. 
O. Pycnia amphigenous, chiefly hypophyllous, few, loosely gregarious, inconspicuous, 
honey-yellow becoming brown, flattened-globoid, 144-175 » in diameter by 80-1444 high; 
1», ostiolar filaments short or wanting. 
I. Aecia chiefly hypophyllous or petiolicolous, gregarious in small groups on yellowish 
spots 1-3 mm. in diameter, cupulate, 0.3-0.4 mm. in diameter; peridium yellowish or whitish, 
the margin recurved, lacerate; peridial cells ellipsoid, 18-23 by 27-40 y, slightly overlapping, 
the outer wall 7-9 « thick, transversely striate, the inner wall thinner, 3-4 yp, finely and evenly 
verrucose; aeciospores angularly globoid or ellipsoid, 14-20 by 20-26 »; wall colorless, thin, 
finely and closely verrucose. 
Il. Uredinia chiefly hypophyllous, scattered or sometimes confluent, roundish or irregular, 
rather small, 0.1-0.5 by 0.1-0.8 mm., early naked, pulverulent, cinnamon-brown, ruptured 
epidermis noticeable; urediniospores ellipsoid, obovoid, or globoid, 20-26 by 26-32 y; wall 
cinnamon- or golden-brown, rather thin, 1.5 y, moderately echinulate, the pores 2, very rarely 
3, superequatorial and opposite. 
III. Telia amphigenous, numerous, scattered or more often confluent, roundish or irregular, 
small, 0.1-0.5 mm. in diameter, early naked, rather compact, chocolate-brown, ruptured epi- 
dermis not conspicuous; teliospores ellipsoid, rather irregular, 15-22 by 32-50 u, rounded or 
narrowed at the ends, slightly or not constricted at septum, wall cinnamon-brown, 1.5-2 u 
thick, thickened over the pores into a lighter umbo, 3-6 u, smooth; pedicel pale, fragile. 
On RANUNCULACEAE: : 
Caliha palustris I,., Indiana, Iowa, Michigan, New Jersey, New York, South Dakota, Wis- 
consin; Ontario. . 
"Type Locality: Near Edinburgh, Scotland, on Caltha palusiris. ; 
DIstRIBUTION: Ontario to New Jersey, and westward to South Dakota and Iowa; also in Europe. 
ILLUSTRATIONS: Beitr. Krypt. Schweiz 2?: f. 225; Bot. Gaz. 19: pl. 2 , f. 4; Holway, N. Am. 
.1: pl. 1, f. 1; Corda, Ic. Fung. 4: pl. 4, f. 40. ; : 
meee Barth. Fungi Columb. 3836; Barth. N. Am. Ured. 333, 823; Ellis & Ev. Fungi 
Columb. 190; Ellis & Ev. N. Am. Fungi 2415. 
