THE UREDINALES FOUND UPON THE ONAGRACEAE 
539 
Dicaeoma Gayophyti Kuntze, Rev. Gen. PI. 3^: 468. 1898. 
Dicaeoma heteranthum Kuntze, Rev. Gen. PI. 3^: 469. 1898. 
Dicaeoma intermedium Kuntze, Rev. Gen. PI. 3^: 469. 1898. 
Dicaeoma Oenotherae Kuntze, Rev. Gen. PI. 3^: 469. 1898. 
Puccinia Gayophyti Speg. Anal. Mus. Nac. B. Ayres III. i: 63. 1902. 
Puccinia Zauchneriae Sydow, Monogr. Ured. i: 435. 1903. 
Puccinia glabella Holway, N. Amer. Ured. i: 76. 1907. 
0. Pycnia amphigenous, among or opposite the aecia, scattered, inconspicuous, 
subepidermal, honey-yellow becoming brown, globose, 85-150 ^ in diameter by 
1 10-170 fj. in height; ostiolar filaments 30-65 ix long. 
1. Aecia amphigenous, chiefly hypophyllous, scattered, from a diffused mycelium, 
numerous, often covering the entire leaf surface, cupulate or sometimes short- 
cylindrical, 0.2-0.5 mm. across; peridium white, margin recurved, lacerate; peridial 
cells rhomboidal, 13-22 by 22-36 ^i, overlapping, the outer wall 5-10 [j. thick, striate, 
the inner wall thinner, 3-6 /jl, moderately verrucose; aeciospores irregularly globoid, 
angular, or ellipsoid, 13-20 by 13-23 jx (usually only to 20 /jl in length) ; wall colorless, 
thin, I fx, minutely verrucose. 
II. Uredinia amphigenous, often only hypophyllous, numerous, scattered, 
occasionally confluent, roundish, small, 0.1-0.8 mm. across, rather early naked, pul- 
verulent, cinnamon-brown, ruptured epidermis noticeable; urediniospores ellipsoid, 
obovoid, or globoid, flattened slightly on two opposite sides, 15-26 by 19-31 m; wall 
cinnamon-brown, thickness somewhat variable, 1.5-3 moderately or sometimes 
closely echinulate, the pores 2, equatorial, rarely slightly superequatorial, in lighter 
colored areas in the flattened sides. 
III. Telia amphigenous, sometimes caulicolous, numerous, scattered or some- 
times confluent, roundish, rather small, 0.2-1 mm. across, early naked, pulverulent 
or sometimes compact, dark chestnut-brown, ruptured epidermis inconspicuous; 
teliospores ellipsoid or obovoid, rounded or somewhat narrowed at one or both ends, 
somewhat variable upon different hosts, 14-27 by 23-50 ix, usually somewhat con- 
stricted at the septum; wall cinnamon- or chestnut-brown, 1.5-3 M thick, occasion- 
ally up to 4 /X thick, apex thicker, 4-12 ,u, sometimes finely and inconspicuously 
verrucose; pedicel pale, rather fragile, usually broken away, but sometimes twice 
the length of the spore. 
On Onagraceae : 
Boisduvalia densiflora (Lindl.) Wats., California, Idaho, Oregon, Washington. 
Boisduvalia densiflora imhricata Greene, California. 
Boisduvalia glabella (Nutt.) Walp., Idaho, Nevada, Oregon. 
Boisduvalia sparsiflora Heller, California. 
Boisduvalia stricta (A. Gray) Greene {B. Torreyi Wats.), Oregon. 
Chamaenerion latifolium (L.) Sweet {Epilobium latifolium L.), Alaska. 
Chylisma cardiophylla (Torr.) Small {Oenothera car diophylla Torr.), California. 
Chylisma hirta A. Nels., Nevada. 
Chylisma scapoidea scorsa A. Nels., Idaho. 
Clarkia pulchella Pursh, Idaho, Oregon, Washington. 
Epilobium adenocaulon Hausskn,, Montana, New Mexico, Washington; Alaskal 
Epilobium affine Bong., Alaska. 
