356 NORTH AMERICAN FLORA [VoLumE 7 
Dicacoma albiperidium Arth, Proc. Ind. Acad. Sci. 1903: 145. 1904. 
Dicaeoma riporia Arth. Résult. Sci. Congr. Bot. Vienne 344. 1906. 
Puccinia quadriporula Arth. Bull. Torrey Club 34: 586. 1907. 
Puccinia Ribesti-Caricis Kleb. Zeits, Pflanzenkr. 17: 134. 1907. 
Puccinia uniporula Orton, Mycologia 4: 201. 1912. 
O. Pyenia chiefly epiphyllous, gregarious, on discolored spots, usually in groups 0.5- 
1.5 mm. across, honey-yellow becoming darker with age, flattened-globoid, 80-180 u in dia- 
meter, 75-150 w high; ostiolar filaments 65-100 uw long. 
I. Aecia chiefly hypophyllous, but appearing also on the twigs, petioles and young fruits, 
gregarious, usually appearing on more or less orange-colored hypertrophied areas 2-8 mm. 
across, cupulate, 0.2~0.3 mm. in diameter; peridium short, spreading, the margin slightly 
recurved, irregularly dentate; peridial cells rhomboidal, 21-27 » long, the outer wall 6-8 uv 
thick, striate, the inner wall 3-5 u, verrucose; aeciospores globoid, 13-18 by 15-21 y;- wall 
colorless, thin, about 1 y, very finely verrucose. 
On GROSSULARIACEAE! 
Grossularia Cynosbati (L.) Mill. (Ribes gracile Michx.), Indiana, Iowa, Michigan, New 
Hampshire, New York, Ohio, Vermont, Wisconsin; Ontario, Quebec. 
Grossularia divaricata (Dougl.) Cov. & Britt. (Ribes divaricatum Dougl.), California, Oregon, 
Washington. 
Grossularia hesperia (McClatchie) Cov. & Britt. (Ribes hesperia McClatchie), California. 
Grossularia hirtella (Michx.) Spach (Ribes saxosum Hook.), Indiana, Maine, Massachusetts, 
Pennsylvania, Vermont; Nova Scotia. 
aay hid ems (Rydlb.) Cov. & Britt. (Ribes inermis Rydb., R. vallicola Greene), 
‘olorado. 
pea pate leptantha (A. Gray) Cov. & Britt. (Ribes leptanthum A. Gray), Colorado, New 
exico. 
Grossularia missouriensis (Nutt.) Cov. & Britt. (Ribes gracile Pursh), Illinois, Indiana, 
Iowa, Kansas, Minnesota, Missouri, Nebraska, Wisconsin. 
Grossularia oxyacanthoides (I,.) Mill., Alaska. 
Grossularia reclinata (L.) Mill. (Ribes Uva-crispa L., R. Grossularia I,.), lowa, North Dakota, 
Wisconsin. 
Grossularia setosa (Lindl.) Cov. & Britt., Montana, Wyoming. 
Ribes acerifolium Howell (R. Howellii Greene), Washington. 
Ribes alpinum I,. (cult.), Alaska. 
Ribes americanum Mill. (R. floridum 1 Hér.), Connecticut, Hlinois, lowa, Michigan, Minne- 
sota, Montana, Nebraska, New York, Ohio, South Dakota, Wisconsin; Ontario. 
Ribes aureum Pursh (Chrysobotrya aurea Rydb.), Colorado, Montana., 
Ribes bracteosum Dougl., Alaska; British Columbia. 
Ribes glandulosum Weber (R. prostratum I,’Hér.), Maine, New Hampshire, New York; 
British Columbia, Nova Scotia; Labrador. 
Ribes Gordonianum Lem. (R. odoratum X sanguineum), Alaska. 
Ribes hudsonianum Richards., Alaska. 
Ribes inebrians Lindl., Colorado, Montana. 
Ribes lacusire (Pers.) Poir. (Limnobotrya lacustris Rydb., L. echinata Rydb.), Alaska, Idaho, 
w Hampshire, Oregon, Vermont; Alberta, Ontario. 
Ribes laxiflorum Pursh, Alaska; British Columbia. 
Ribes malvaceum Smith, California. 
Ribes odoratum Wendl. (R. longiflorum Nutt., Chrysobotrya odorata Rydb.), Kansas, Okla- 
homa, Wisconsin. 
Ribes petiolare Dougl., Idaho. 
Ribes sanguineum Pursh, Alaska, Oregon. 
Ribes trisie Pall. (R. rubrum A. Gray not L.), Alaska. 
Ribes vulgare Lam., Alaska, Indiana, Maryland. 
II. Uredinia chiefly hypophyllous, scattered, oval or oblong, 0.1-0.5 mm. long, early naked 
or on some hosts rather tardily naked, somewhat pulverulent, ruptured epidermis usually not 
conspicuous; urediniospores globoid, broadly ellipsoid, or obovoid, 15-21 by 19-24 uw (rarely 
larger, up to 25-38 uw; wall golden- or chestnut-brown, 1.5-2 » thick, moderately, finely, and 
evenly echinulate, the pores 3 or sometimes 4, equatorial, not infrequently partly or wholly, 
1 near the hilum, in a few cases 2 or 3 somewhat sub-equatorial. ; 
Ill. Telia chiefly hypophyllous, scattered, roundish or oblong, 0.1—0.2 mm. broad by 0.1- 
0.5 mm. long, sometimes appearing larger when confluent end to end, early naked, or on some 
hosts rather tardily naked, ruptured epidermis not conspicuous, pulvinate, blackish-brown, or 
on some hosts long covered by the epidermis and grayish-black; teliospores broadly clavate, 
12-24 by 26-58 uw, roundish, truncate, or rarely acuminate above, slightly or not constricted 
at septum; wall cinnamon- or light chestnut-brown, 1-1.5 w thick, thicker at apex, 4-10 yp, 
smooth; pedicel one half length of spore or less, slightly tinted. 
The species shows wide variation in the number and arrangement of the uredinial germ-pores 
and when more fully studied it may be found that these variations indicate more or less firmly estab- 
