Part 4, 1920] AECIDIACEAE 279 
On POACEAE: 
Tripsacum lanceolatum Rupr. (T. acutiflorum Fourn.), Mexico (state). 
Tripsacum latifolium Hitche., Guatemala; Nicaragua; Salvador. 
Zea Mays L., Porto Rico. 
TYPE LOcALIty: Near City of Mexico, Mexico, on “Tripsacum dactyloides,” error for T. 
lanceolatum. 
DisTriBuTIon: West Indies, southern Mexico, and Central America. 
ILLustTRaTION: Bull. Lab. Nat. Hist. Univ. Iowa 5: 175, f. 1. 
3. Dicaeoma polysorum (Underw.) Arth. Résult. Sci. Congr. Bot. 
Vienne 344. 1906. 
Puccinia polysora Underw. Bull. Torrey Club 24: 86. 1897. 
O and IJ. Pycnia and aecia unknown. 
II. Uredinia amphigenous, numerous, oblong, 0.5-1 mm. long, tardily dehiscent by a 
longitudinal slit, slightly pulverulent, cinnamon-brown; urediniospores globoid, ellipsoid or 
obovoid, 21-29 by 27-34 »; wall moderately thin, 1.5-2 u, light cinnamon-brown, finely and 
rather sparsely echinulate, the pores 5, rarely 4, equatorial. 
III. Telia amphigenous, rather few, scattered, linear, 0.5—1.5 mm. in length, long covered 
by the epidermis, compact, chocolate-brown; teliospores irregularly ellipsoid or obovoid, 18-26 
by 29-40 uw, rounded or truncate above, narrowed below, moderately or not constricted at 
septum; wall chestnut-brown, rather thin, 1.5 4, only slightly thickened at apex, up to 34, 
smooth; pedicel tinted, about one-fourth length of spore or less. 
On ,POACEAE: 
Br canal dactyloides L,. (T. monostachyum Willd.), Alabama, Florida, New Jersey; Santo 
omingo. : 
Tripsacum lanceolatum Rupr. (T. acutiflorum Fourn.), Morelos. 
Tripsacum latifolium Hitche., Cuba. 
Type Locauity: Auburn, Alabama, on Tripsacum dactyloides. 
DISTRIBUTION: New Jersey to Alabama, West Indies, and central Mexico. 
Inuustrations: Bull. Lab. Nat. Hist. Univ. Iowa 5: 176, f. 2; ol. 1, f. 36a. 
Exsiccati: Arth. & Holway, Ured. Exs. Ic. 36a; Ellis & Ev. Fungi Columb. 2068. 
4. Dicaeoma Ceanothi (Ellis & Kellerm.) Arthur & Fromme. 
Aecidium Ceanothi Ellis & Kellerm. Bull. Torrey Club 11:114. 1889. 
Puccinia Tripsaci Dietel & Holway; Holway, Bot. Gaz. 24:27. 1897. 
Puccinia Pattersoniae Sydow, Monog. Ured. 1: 820, 1904. 
Dicaeoma Tripsaci Arth. Résult. Sci. Congr. Bot. Vienne 344. 1906. 
Puccinia Ceanothi Arth. Mycologia 2: 233. 1910. 
O. Pyenia epiphyllous in irregular, crowded groups of varying size, on discolored spots, 
inconspicuous, deep-seated, globose, about 100 » in diameter; ostiolar filaments 35-55 u long. 
I. Aecia hypophyllous, caulicolous, and fructicolous, in irregular, crowded groups on 
somewhat hypertrophied areas, short-cylindric, 0.3-0.4 mm. broad, 0.5 mm. high; peridium 
yellowish, margin entire or irregularly lacerate and slightly recurved; peridial cells oblong in 
vertical section, 21-26 by 24-29 », overlapping, the outer wall thick, 10-13 », transversely 
striate, smooth, the inner wall thinner, 5~7 », roughly verrucose; aeciospores globoid or ob- 
long, 18-21 by 19-24 w; wall moderately thick, 2-2.5 u, colorless, inconspicuously verrucose. 
ON RHAMNACEAE: : 
Ceanothus azureus Desf., Mexico (state). . . 
Ceanothus ovatus Desf. (C. ovalis Bigel.), Wisconsin. 
Ceanothus pubescens (T. & G.) Rydb., Kansas, N ebraska. 
Il. Uredinia hypophyllous, oblong-linear or linear, 0.5~1 mm. long, early naked, pul- 
verulent, cinnamon-brown, ruptured epidermis evident; urediniospores globoid or broadly 
ellipsoid, 24-30 by 27-34 u; wall thick, 2-3 u, golden- or cinnamon-brown, moderately echi- 
nulate, the pores 3 or 4, usually 3, approximately equatorial. 
Ill. Telia usually hypophyllous, crowded and often confluent, oblong to linear, 0.5- 
1.5 mm. long, rather tardily naked, compact, pulvinate, blackish-brown, ruptured epidermis 
conspicuous; teliospores ellipsoid or obovoid, 18-23 by 35-50 yu, rounded or obtuse at both 
ends, often narrowed below, slightly constricted; wall chestnut-brown, smooth, 1.5-2.5 uw thick, 
thicker at apex, 5-9 u; pedicel persistent, tinted, as long as spore or longer. 
