Part 4, 1920] AECIDIACEAE 319 
ellipsoid or obovoid, 18-21 by 23-26 u; wall golden-yellow, moderately and finely verrucose- 
echinulate, 1.5-2 » thick, often much thicker above, 3-7 », the pores about 6, scattered and 
indistinct. 
III. Telia amphigenous, scattered, rounded or elliptic, small, 0.3-0.5 mm. long, early 
naked, pulverulent, dark chocolate-brown, pulvinate, ruptured epidermis not conspicuous; 
teliospores oblong, 18-26 by 27-42 », rounded or obtuse above, rounded or rarely somewhat 
attenuate below, slightly or not constricted at septum; wall dark chestnut-brown, 2-2.5 » 
thick, only slightly thickened above, 5-7 4; pedicel golden, more deeply colored next to spore, 
once or twice length of spore, often attached obliquely. 
On PoackEakE: 
Chloris verticillata Nutt., Kansas, New Mexico, Oklahoma, Texas. 
Chloris virgata Sw. (C. elegans HB.K. ), Guanajuato, Jalisco, San Louis Potosi. 
TyPE LocaLity: Paraguay, on Chloris sp. 
DrstRiBution: Kansas to central Mexico; also in South America. 
ILLUSTRATIONS: Bull. Lab. Nat. Hist. Univ. Iowa 5: pl. 7, f. 56a, b 
Exsiccati: Arth. & Holway, Ured. Exs. Ic. 56a, b; Barth: Fungi Columb. 2657, 2658; Barth, 
N. Am. Ured. 129; Sydow, Ured. 2018. 
64. Dicaeoma.exasperans (Holway) Arthur & Fromme. 
Puccinia exasperans Holway, Ann. Myc. 3:21, 1905. 
Oand I. Pycnia and aecia unknown. 
II. Uredinia amphigenous, few, scattered, elliptic or oblong, small, 0.3-0.5 mm. long, 
early naked, pulverulent, cinnamon-brown, ruptured epidermis inconspicuous; urediniospores 
globoid, broadly ellipsoid or obovoid, 18-25 by 21-29 «; wall cinnamon-brown, I-1.5 » thick, 
closely and strongly echinulate, the pores about 8, scattered. 
III. Telia amphigenous, scattered and evenly distributed, seldom if ever confluent, elliptic 
or oblong, 0.3-0.5 mm. long, early naked, blackish-brown, pulvinate, ruptured epidermis not 
apparent; teliospores ellipsoid or oblong, seldom globoid, 16-24 by 25-29 yw, rounded at both 
ends, or occasionally obtuse above, only slightly or not at all constricted at septum; wall dark 
chestnut-brown, 1.5-2.5 « thick, only slightly thicker above, 3-6 u; pedicel pale-yellow or color- 
less, twice or thrice length of spore, sometimes attached laterally or at an angle. 
ON POACEAE: 
Bouteloua curtipendula (Michx.) Torr. (B. racemosa Lag., Atheropogon curtipendulus Fourn.), 
Texas; Morelos. 
Bouteloua Pringlei Scribn., Guerrero. 
Type LOcALITY: Cuernavaca, Mexico, on Boulteloua curtipendula. 
DrisTrisuTion: Northern Texas to southern Mexico. 
Exsiccatt: Barth. Fungi Columb. 2654. 
65. Dicaeoma Boutelouae (Jennings) Arthur & Fromme. 
Diorchidium Boutelouae Jennings, Bull. Texas Exp. ae 9:25. 1890. 
Puccinia Boutelouae Holway, Ann. Myc. 3:20. 1905 
O and I. Pyecnia and aecia unknown. 
II. Uredinia not seen; urediniospores intermixed with the teliospores, globoid, oblong or 
obovoid, 16-23 by 19-23 u; wall pale-yellow or colorless, 1.5-2 wu thick, closely and sometimes 
strongly echinulate, the pores several, obscure, evidently scattered; amphispores sometimes 
abundant, ellipsoid or globoid, 24-26 by 27-32 y, the wall chestnut-brown, 2.5—-3 u thick, moder- 
ately and strongly echinulate, the pores 6-8, scattered, the pedicel pale-golden or colorless, once 
or twice length of spore. 
III. Telia mostly epiphyllous, scattered and distinct, seldom confluent, elliptic or oblong, 
small, 0.3-0.7 mm. long, early naked, compact, blackish-brown, pulvinate, ruptured epidermis 
not apparent; teliospores globoid or broadly ellipsoid, 21-24 by 27-32 yu, rounded at both ends, 
not constricted at septum, the septum usually oblique or vertical; wall dark chestnut-brown, 
2.5-3 w thick, 5-7 u above;.pedicel pale-yellow or golden, twice or thrice length of spore, usually 
attached laterally or at an angle. 
On POACEAE: 
Bouteloua curtipendula (Michx.) Torr. (B. racemosa Lag., Atheropogon curtipendulus Fourn.), 
Texas; Guerrero. 
Type LocaLity: College Station, Texas, on Bouteloua racemosa. 
DisTRIBUTION: Eastern Texas to southern Mexico. 
