Part 5, 1920] AECIDIACEAE 403 
up to 7-15 p, smooth; pedicel concolorous above, hyaline below, stout, 5-7 » broad at point 
of attachment, tapering, as long as spore or longer, the wall thin. 
ON CONVOLVULACEAE: 
Evolvulus nummularis L., Porto Rico. 
Evoloulus Nuittallianus R. & S. (Z. pilosus Nutt., E. argenteus Pursh), Colorado, Kansas, 
Nebraska, Texas. 
Evolvulus sericeus Sw., Texas. 
TYPE LOCALITY: Manhattan, Kansas, on “‘Lithospermum canescens,” error for Evoluulus 
Nuttallianus. 
DISTRIBUTION: Nebraska and Colorado southward to Texas and in Porto Rico; also in Japan. 
Exsiccati: Barth. Fungi Columb. 2962; Barth. N. Am. Ured. 45; Clements, Crypt. Form. 
Colo. 568; Ellis & Ev. Fungi Columb. 2151; Sydow, Ured. 2123. 
198. Dicaeoma Cressae (DC.) Kuntze, Rev. Gen. 
33: 468. 1898. 
Aecidium Cressae DC. Fl. Fr. 6: 89. 1815. 
Puccinia Cressae Lagerh. Bol. Soc. Brot. 7: 131. 1889. 
Puccinia cretica Holway, Erythea 5:31. 1897, 
O. Pycnia not seen. 
I. Aecia hypophyllous, numerous, crowded, covering entire under surface of leaf, short- 
cylindric, 0.3-0.6 mm. across; peridium whitish, the margin erect, denticulate or somewhat 
lacerate; peridial cells rhomboidal, 20-30 by 32-42 u, considerably overlapping, the outer and 
inner wall of about equal thickness, 7 4; aeciospores angularly globoid, 15-22 by 18-26 y; wall 
light-yellow or colorless, 1-1.5 » thick, finely and inconspicuously verrucose. 
II. Uredinia amphigenous, scattered, punctiform, roundish or irregular, up to 0.7 mm. 
across, early naked, pulverulent, cinnamon-brown, ruptured epidermis conspicuous; uredinio- 
spores obovoid or pyriform, 19-23 by 27-33 u; wall golden-brown, 1.5-2 «4 thick, moderately 
echinulate, the pores 2 or more often 3, equatorial. 
III. Telia amphigenous, numerous, scattered, roundish or often irregular, 0.2-0.8 mm. 
across, early naked, compact, pulvinate, dark-brown, ruptured epidermis evident; teliospores 
ellipsoid or oblong-cylindric, 19-26 by 32-42 4, rounded above and below, moderately con- 
stricted at septum; wall golden- or cinnamon-brown, 1.5—2.5 yu thick, rarely thickened at apex 
to 3 uw, smooth; pedicel fragile. 
On CONVOLVULACEAE: 
Cressa aphylla A. Heller, Texas. 
Cressa depressa Goodding, Arizona, Utah. 
Cressa erecta Rydb., Utah. 
Cressa truxillensis HB. K., California, Nevada, New Mexico, Texas; Lower California, 
Sonora. 
Type Locality: Pérauls, near Montpelier, France, on Cressa cretica. 
DISTRIBUTION: Texas westward to Pacific coast, including portions of northern Mexico and 
southern Utah and Nevada; also in northern Africa and Europe. 
eres Barth. N. ‘Am. Ured. 1644, 1645; Garrett, Fungi Utah. 91, 158; Sydow, Fungi Exot. 
199. Dicaeoma Giliae (Hark.) Kuntze, Rev. Gen. 
33: 469. 1898. 
Puccinia Giliae Hark. Bull. Calif. Acad. 1:34. 1884. 
O and I. Pycnia and aecia not seen. 
II. Uredinia amphigenous, numerous, scattered or confluent in groups of two or three, 
roundish, 0.2-1.5 mm. in diameter, tardily naked, pulvinate, cinnamon- or chestnut-brown, 
ruptured epidermis conspicuous; urediniospores ellipsoid or obovoid, 16-23 by 21-26 u; wall 
cinnamon-brown, 1.5~2.5 » thick, finely and closely echinulate, the pores 2, equatorial. 
III. Telia amphigenous, caulicolous, numerous, scattered or confluent in small groups, 
roundish or irregular, 0.2-1 mm. in diameter, rather tardily naked, pulvinate, compact, dark 
chestnut-brown, ruptured epidermis conspicuous; teliospores ellipsoid, 18-23 by 35-58 y, 
rounded or attenuate, occasionally truncate above, narrowed or rounded below, moderately 
constricted at septum; wail cinnamon-brown, darker at apex, 1.5-2.5 » thick, thicker at apex, 
7-10 wu, smooth; pedicel hyaline, thin-walled, two and a half to three times length of spore. 
