Part 4, 1920] AECIDIACEAE ane 
Musineon divaricatum (Pursh) Coult. & Rose, South Dakota. 
Norta altissima (L.) Britton (Sisymbrium altissimum L.), Colorado. 
Radicula sinuata (Nutt.) Greene (Roripa sinuata Hitche., Nasturtium sinuatum Nutt.), 
_ Colorado, Nebraska. 
Sisymbrium Nasturtium-aquaticum L. (Nasturtium officinale R. Br.), Arizona. 
Sophia andrenarum Cockerell, New Mexico. 
Sophia incisa (Engelm.) Greene (Sisymbrium incisum Engelm.), Colorado, 
Sophia intermedia Rydb., Colorado, Nebraska. 
Sophia sp., Nevada. 
Stanleya pinnata (Pursh) Britton (S. pinnatifida Nutt.), Colorado. 
Thelypodium laciniatum Endl., California. 
Thelypodium sagittatum (Nutt.) Endl., Neveda. 
ON CaPpPaARIDACEAE: 
Cleomella Montrosae Payson, Colorado. 
Cleomella parviflora A. Gray, Nevada. 
?Isomeris arborea Nutt., California. 
Peritoma serrulatum (Pursh) DC. (Cleome serrulata Pursh, C. integrifolia T. & G.), Arizona, 
Colorado, Montana, Nebraska, New Mexico. 
Peritoma Sonorae (A. Gray) Rydb. (Cleome Sonorae A. Gray), Colorado. 
On TROPAEOLACEAE: 
Tropacolum majus L., Utah. 
On LoasackEak: 
Mentzelia sp., Colorado. 
ON ONAGRACEAE: 
Chylismia scapoidea Nutt. (Oenothera scapoidea Nutt.), Nevada. 
Sphaerostigma chamaenerioides (A. Gray) Small, Arizona. 
ON PRIMULACEAE: 
Glaux maritima I,., Saskatchewan. 
ON GENTIANACEAE: 
Centaurium calycosum (Buckl.) Fernald, New Mexico. 
ON POLEMONIACEAE: 
Gilia inconspicua (J. E. Smith) Dougl., Arizona. 
Linanthus Bigelovit (A. Gray) Greene (Giliae Bigelovii A. Gray), Arizona. 
On HypDROPHYLLACEAE: 
Phacelia crenulaia Torr., Arizona. 
ON HELIOTROPIACEAE: 
Heliotropium xerophilum Cockerell (H. spathulatum Rydb.), Arizona, California, New 
Mexico, Utah. 
ON BoRsGINACEAE: 
Amsinckia Menziesii (Lehm.) Nels. & Machr. (A. intermedia A. Gray), Nevada. 
Cryptantha barbigera (A. Gray) Greene (Krynitzkia barbigera A. Gray), Arizona. 
Cryptaniha pterocarya (Torr.) Greene, Arizona. 
Lappula heterosperma Greene, Arizona. 
Lappula occidentalis (S. Wats.) Greene, Arizona. 
Pectocarya linearis (R. & P.) DC., Arizona. 
ON VERBENACESE: 
Verbena ciliata Benth., Arizona. 
ON SOLANACEAE: 
Chamaesaracha Coronopus (Dunal) A. Gray, New Mexico. 
Datura meteloides DC., Arizona. 
Nicotiana trigonophylla Dunal, Arizona. 
Petunia parvifiora Juss., Arizona. 
Quincula lobata (Torr.) Raf. (Physalis lobata Torr.), Colorado. 
On LOBELIACEAE: 
Nemocladus ramosissimus Nutt., Arizona. 
II. Uredinia epiphyllous, seldom hypophyllous, scattered or crowded, small, about 
0.5 mm. long, dark cinnamon-brown, ruptured epidermis conspicuous; urediniospores globoid 
or broadly ellipsoid, 18-24 by 19-30 u; wall moderately thick, 2-3 u, golden- or light cinnamon- 
brown, finely verrucose, the pores 4—6, usually equatorial, or one apical and the others equa- 
torial, or more or less scattered. 
III. Telia mostly epiphyllous, numerous, often confluent, oblong, 0.5—-2 mm. long, early 
naked, pulvinate, dark chocolate-brown, ruptured epidermis usually inconspicuous; telio- 
spores broadly ellipsoid, oblong or obovoid-oblong, 18-28 by 27-45 u, rounded, obtuse or 
somewhat attenuate above, rounded or tapering below, moderately constricted at septum; 
wall chestnut-brown, 1.5-2 4 thick, 6-12 u at apex, smooth; mesospores common, somewhat 
narrower and shorter than the telisopores; pedicel about twice length of spore, tinted only at 
attachment. 
The species is composed of several ill defined races as shown by cultures. Morphologically 
it is not distinguishable from Nigredo Peckiana (Farl.) Arth, except in the predominance of 
two-celled teliospores. The two forms are separately maintained for convenience but should 
eventually be united under one name. 
