Part 5, 1920] AECIDIACEAE 361 
I. Aecia chiefly hypophyllous, in crowded sometimes orbicular groups 1-3 mm. across; 
peridium whitish, short-cylindric, usually about 0.5 mm. high, the margin usually erect, some- 
what erose; peridial cells rhomboidal, 20-30 » long, overlapping, the outer wall thick, 5-9 y, 
transversely striate, smooth, the inner wall thinner, 3—4 », verrucose ; aeciospores globoid, 
12-18 by 15-21 y; wall nearly colorless, thin, about 1 y, minutely verrucose. 
On CARDUACEAE: 
Artemisia argophylla Rydb., Colorado. 
Artemisia aromatica A. Nelson, Montana. 
Artemisia biennis Willd., North Dakota. 
Artemisia Brittonii Rydb., Colorado. 
Artemisia camporum Rydb., Colorado, Iowa, Nebraska. 
Arlemisia cana Pursh, Montana. 
Artemisia Carruthii Wood (A. kansana Britton), Nebraska, North Dakota, Texas. 
Artemisia caudata Michx., Nebraska. 
Artemisia dracunculoides Pursh, Colorado, Nebraska. 
Artemisia filifolia Torr., Nebraska. 
Artemisia Forwoodii S. Wats., Nebraska, North Dakota. 
Artemisia franserioides Greene, Colorado, New Mexico. 
Artemisia frigida Willd., Colorado, Montana, Nebraska, North Dakota, Wyoming. 
Artemisia glauca Pall., Colorado. 
Artemisia gnaphaloides Nutt., Colorado, Montana, Nebraska, New Mexico, North Dakota, 
South Dakota; Manitoba. 
Artemisia heterophylla Nutt., California. 
Artemisia longifolia Nutt., Montana, Nebraska, North Dakota. 
Artemisia pacifica Nutt. (A. Scouleriana Rydb.), Colorado. 
Artemisia silvicola Osterh., Colorado. 
Artemisia tripartita Rydh. (A. trifida Nutt.), Montana. 
Artemisia sp., Oregon. 
II. Uredinia chiefly hypophyllous, scattered, oblong, 0.2-0.5 mm. long, rather early 
naked, cinnamon-brown, ruptured epidermis conspicuous; urediniospores broadly ellipsoid, 
15-20 by 20-26 uw; wall cinnamon-brown, 1-1.5 » thick, rather finely echinulate, the pores 2, 
slightly above the equator, or apparently equatorial. 
III. Telia chiefly hypophyllous, scattered, roundish or oblong, 0.1-0.3 mm. wide by 
0.2-1.2 mm. long, early naked, pulvinate, ruptured epidermis noticeable; teliospores clavate- 
oblong, 16-26 by 35-55 , slightly or not constricted at septum, rounded or obtuse above; 
wall dark chestnut-brown above, somewhat paler below, 1.5-2 » thick, much thicker above, 
7-12 u, smooth; pedicel tinted, one half length of spore or more. 
On CYPERACEAE: 
Carex diandra Schrank (C. teretiuscula Gooden.), Nebraska. 
Carex Douglasii Boott, Colorado, Nebraska, New Mexico, North Dakota. 
Carex filifolia Nutt., Montana, Nebraska, North Dakota, South Dakota, Wyoming. 
Carex Geyeri Boott, Colorado. 
Catex heliophila Mackenzie, Colorado, Minnesota, Montana, Nebraska, North Dakota. 
Carex inops L. H. Bailey, Oregon. 
Carex multicaulis I,. H. Bailey, California, Oregon. 
Carex obtusata Lilj., Colorado. 
Carex oligocerpa Schkuhr, Wisconsin. 
Carex petasata Dewey (C. Liddonii Boott), Colorado, Montana, Utah. 
Carex praegracilis W. Boott (C. marcida Boott), Colorado, Nebraska, Nevada, North 
Dakota, Oregon, Wyoming; Manitoba. 
Carex Rossii Boott, Colorado, Oregon; British Columbia. 
Carex stenophylla Wahl., Colorado, Montana, Nebraska, North Dakota, Utah, Wyoming; 
Vukon. 
TyPE LOCALITY: Near Minusinsk, southern Siberia, on Ariemisia Dracunculi. 
DistRIBUTION: Mountains and adjacent plains from western Texas and iets California 
northward to Manitoba and central Yukon, 63° north latitude; also in Siberia and Jap 
Exsiccati: Barth. Fungi Columb. 2446, 4165, 4275, 4376, "4469, 4675, 4765, 4980" 3078; Barth. 
N. Am. Ured. 273, 475, 668, 872, 1080, 1476, 1876, 1877, 1973, 1974, 2075, 2173, 2272; Brenckle, 
Fungi Dak. 106, 117, 131, 189, 346, Clements, Crypt. "Form. Colo. "543, 593, Elis & Ev. Fungi Columb. 
1641, 1664; Ellis & Ev. N. Am. Fungi 2219b; D. Griff. W. Am. Fungi 277a 360, 360a; Sydow, Ured. 
1712, 2435, 
134. Dicaeoma Phrymae (Halsted) Arthur & Kern. 
Aecidium Phrymae Halsted, Jour. Myc. 2:52. 1886. 
Puccinia Phrymae Arth. Jour. Myc. 14:22. 1908. 
O. Pycnia amphigenous, few, gregarious, in small crowded groups, inconspicuous, honey- 
yellow becoming blackish-brown, slightly flattened-globoid, 77-110 » in diameter by 65~80 » 
high; ostiolar filaments 40-50 u long. 
