Part 6, 1921] AECIDIACEAE 433 
II. Uredinia hypophyllous or occasionally amphigenous, scattered, small, 0.2-0.7 mm. 
across, early naked, pulverulent, dark cinnamon-brown, ruptured epidermis usually not con- 
spicuous; urediniospores globoid, obovoid, or ellipsoid, 19-28 by 24-30 4; wall cinnamon- or 
light chestnut-brown, 1.5-2.5 » thick, moderately echinulate, the pores 2, opposite and equa- 
torial, occasionally placed obliquely. 
II. Telia usually hypophyllous, becoming somewhat amphigenous, numerous, scattered, 
roundish, small, 0.2-0.7 mm. across, early naked, pulvinate, blackish-brown, ruptured epider- 
mis usually not conspicuous; teliospores clavate, oblong or ellipsoid, 22-30 by 32-50 z, obtuse 
or rounded at apex, narrowed or rounded below, slightly or not constricted at septum; wall 
dark cinnamon- or chestnut-brown, often somewhat lighter below, 2-3.5 uw thick, smooth, the 
apex thickened, 5-12 uw, with a lighter-colored umbo; pedicel colorless or slightly tinted near 
spore, fragile, short or equaling spore in length. 
On CaRDUACEAE: 
Verbesina diversifolia DC., Oaxaca. 
Verbesina Fraseri Hemsl., Guatemala. 
Verbesina Holwayi B. L. Robinson, Guatemala. 
Verbesina pinnatifida Cav., Morelos. 
?Verbesina sphaerocephala A. Gray, Jalisco. 
Verbesina sublobata Benth., Guatemala. 
Verbesina tetraptera A. Gray, Mexico (state), Michoacan, Oaxaca. 
Verbesina texana Buckl., Texas. 
Verbesina turbacensis H.B.K., Costa Rica. 
Verbesina virginica V,., Arkansas, Louisiana, Texas. 
Ximenesia encelioides Cav., Texas. 
TYPE LOcALIry: Austin, Texas, on Verbesina virginica. 
DisTRIBUTION: Arkansas to Texas and Central America. 
Exsiccati: Barth. Fungi Columb. 2660, 4567; Barth. N. Am. Ured. 323, 834; Kellerm. Fungi 
Sel. Guat. 4. 
257. Dicaeoma invelatum (H. S. Jackson) Arthur & Jackson. 
Puccinia invelata H. S. Jackson; Arth. Bull. Torrey Club 46:119. 1919. 
O. Pycnia epiphylious on slightly raised spots, few, gregarious, inconspicuous, orange, 
flattened or globoid, 115 by 112 u; ostiolar filaments 25-40 u long. 
I. Aecia hypophyllous, scattered, solitary or in groups of two or three, hemispheric, long 
covered by the epidermis; peridium white, the margin lacerate; peridial celis ellipsoid, 14-18 
by 27-35 yp, overlapping, the wall colorless, 3 «4 thick, the outer wall smooth, the inner wall 
finely and irregularly but rather prominently verrucose; aeciospores ellipsoid, 16-23 by 24- 
26 uw; wall 1-1.5 » thick, closely verrucose, with fine low warts. 
II. Uredinia hypophyllous, numerous, scattered, roundish, small, 0.2-0.4 mm. across, 
early naked, somewhat pulverulent, pulvinate, cinnamon-brown, ruptured epidermis not con- 
spicuous; urediniospores globoid, ellipsoid, or obovoid, 20-26 by 24-29 u; wall cinnamon- or 
light chestnut-brown, 1.5-2u thick, prominently and moderately echinulate, the pores 2, 
opposite and equatorial with indistinct smooth area surrounding the pores. 
Ill. Telia hypophyllous, becoming somewhat amphigenous, numerous, scattered, some- 
times confluent, roundish, small, 0.1-0.4 mm. across, early naked, compact, becoming some- 
what pulverulent, chestnut-brown, ruptured epidermis inconspicuous; teliospores ellipsoid or 
obovoid, often somewhat irregular, 19-26 by 32-45 u, obtuse or rounded above, more or less 
narrowed below, slightly constricted at septum; wall cinnamon- or light chestnut-brown, 
laminate, thin, 1.5-2.5 » thick, thickened above, 7-104, with distinct and somewhat paler 
umbo; pedicel colorless, once to once and a half length of spore, usually deciduous. 
On CARDUACEAE: . 
Verbesina montanoifolia Rob. & Greenm., Michoacan. 
Typr Locality: Patzcuaro, Michoacan, on Verbesina montanotfolia. 
DistriBuTIon: Michoacan. ; 
Exsiccati: Barth. N. Am. Ured. 426; Barth. Fungi Columb. 5055. 
258. Dicaeoma abruptum (Dietel & Holway) 
Arthur & Jackson. 
Puccinia abrupta Dietel & Holway; Dietel, Hedwigia 37: 208. 1898. 
Puccini Spee Dietel & Holway; Holway, Bot. Gaz. 31: 332. 1901. 
Puccinia Ximenesiae Long, Bull. Torrey Club 29: 114. 1902. 
Puccinia afinis Sydow, Monog. Ured. 1: 174. 1902. 
