Part 2, 1907] AECIDIACEAE 149 
III. Telia chiefly epiphyllous, scattered, round, 0.2-0.7 mm. across, early naked, com- 
pact, chocolate-brown, ruptured epidermis inconspicuous; teliospores at first globose, soon 
depressed above and below, becoming disc-shaped, 12-15 u long, 30-38 » broad; wall choco- 
late-brown, thick, 5-6 4, closely and rather indistinctly verrucose, apex without umbo ; 
pedicel colorless, firm, 5 # thick, 50-75 » long, slightly roughened at base. 
ON SPONDIACEAE : : 
Schmalizia Emoryt Greene, New Mexico. 
Schmalizia schmidelioides (Schlecht.) Greene (Rhus schmidelioides Schlecht.), Michoacan. 
TYPE LOCALITY: Patzcuaro, Mexico, on Rhus schmidelioides. 
DISTRIBUTION : Southern border of the United States to southern Mexico. 
4. Pileolaria mexicana Arthur, sp. nov. 
O. Pycnia unknown. 
II. Uredinia chiefly hypophylious, scattered over large areas, often crowded, round, 
0.25-0.5 mm. across, early naked, copiously pulverulent, chestnut-brown, ruptured epider- 
mis inconspicuous; urediniospores oval or obovate, 25-30 by 38-52, rounded above, obtuse 
or narrowed and semihyaline below; wall dark golden-brown, thick, 3-6 #, verrucose, with 
prominent and well separated longitudinal rows of tubercles, slightly, or not thickened at 
apex, pores 3, large, usually somewhat subequatorial, rather indistinct. 
Ill. Telia unknown. 
ON SPONDIACEAE: 
Styphonia mollis (H.B.K.) Nutt. (Rhus mollis H.B.K.), Oaxaca. 
Type collected at Oaxaca, Mexico, November 10, 1903, £. W. D. Holway 5361. 
7. DISCOSPORA Arthur, gen. nov. 
Cycle of development includes pycnia andtelia. Pycnia subcuticular, telia subepidermal. 
Pyecnia hemispherical or frustum-like; hymenium flat; ostiolar filaments wanting. 
Telia erumpent, definite. Teliospores borne singly on pedicels, one-celled, flattened 
above and below; wall colored, verrucose. 
Type species, Pileolaria effusa Peck (on Rhus sp.). 
1. Discospora effusa (Peck) Arthur. 
Pileolaria effusa Peck, Bot. Gaz.7: 55, 1882. 
Uromyces effusus De-Toni, in Sace. Syll. 7: 576. 1888. 
O. Pycnia amphigenous and caulicolous, exceedingly numerous, thickly scattered 
along the petioles and veins, preceding or among the telia, papillose, conspicuous, sub- 
cuticular, becoming blackish-brown, frustum-like, 60-80 # in diameter, two thirds as high. 
Ill. Telia amphigenous and caulicolous, numerous, thickly scattered over young 
branches, petioles, and along the veins, roundish, small, 0.25 mm. across, early naked, 
exceedingly pulverulent, chocolate-brown, ruptured epidermis inconspicuous; teliospores 
at first globose, soon depressed above and below, becoming disc-shaped, 17-19 long, 
21-26 » broad; wall dark cinnamon-brown, medium thin, 2-2.5, thicker at apex, 3-5 4, 
with a clear umbo, finely and rather indistinctly verrucose; pedicel colorless, short, one 
to one and a half times length of spore. 
ON SPONDIACEAE : 
Rhus sp., Arizona. ; ‘ 
TYPE LOCALITY : [Santa Rita Mts.] Arizona, on ‘‘ Rhus, probably R. aromatica or R. irtloba.” 
DISTRIBUTION: Known only from the type locality. 
8. HEMILEIA Berk. & Br. Gard. Chron. 1869: 1157. 1869. 
Cycle of development imperfectly known; only uredinia and telia recognized, both 
subepidermal. 
Uredinia formed beneath the stomata, erumpent, without peridium or paraphyses. 
Urediniospores borne singly on short pedicels, which arise from a protruding hymenium of 
agglutinated hyphae, obovate, laterally flattened and dorsiventral; wall pale-yellow, smooth 
on ventral side, papiliose on dorsal side, pores obscure or. absent. 
