Part 6, 1921] AECIDIACEAE 431 
252. Dicaeoma inauditum (Jackson & Holway) 
Arthur & Jackson. 
Puccinia inaudita Jackson & Holway; Arth. Am. Jour. Bot. 5: 535. 1918.1 
O. Pycnia amphigenous, chiefly epiphyllous, few to many, gregarious, in small groups 
0.5-1.5 mm. across, often on somewhat raised spots, conspicuous, deep-seated, dark-brown, 
globoid or flask-shaped, 120-160 by 140-190 u; ostiolar filaments up to 112 » long. 
I. Aecia amphigenous, few, gregarious or crowded in groups 1.5-3 mm. across, among or 
opposite the pycnia or more numerous along the veins beneath, cylindric, 0.5—2.5 mm. long, 
0.2-0.3 mm. across; peridium whitish, membranous, splitting irregularly at apex and with 
one or two longitudinal slits, later becoming deeply lacerate and breaking away; peridial cells 
seen in face view angularly ellipsoid or polyhedral, 20-30 by 45-55 yu, the wall colorless, 1-1.5 4 
thick, very finely and closely verrucose-rugose; aeciospores somewhat angularly ellipsoid or 
globoid, 16-24 by 24-32 wu; wall pale cinnamon-brown, 1.5-2.5 u, coarsely tuberculate or tuber- 
culate-rugose with colorless markings giving the appearance of reticulations. 
II. Uredinia hypophyllous, few, scattered, round or oval, 0.2-0.4 mm. across, early 
naked, pulverulent, dark cinnamon-brown, ruptured epidermis evident; urediniospores ellip- 
soid or obovoid, 19-21 by 24-29 «; wall golden-brown, rather thick, 2 4, moderately echinulate, 
the pores 30 4, scattered. 
III. Telia hypophyllous, few, scattered, round, 0.2-0.8 mm. across, early naked, pulvi- 
nate, golden-brown becoming whitish on germination, ruptured epidermis not conspicuous; 
teliospores oblong or fusiform, 16-19 by 42-64 p», rounded or obtuse at apex, rounded or usually 
somewhat narrowed at base, conspicuously constricted at septum; wall colorless, uniformly 
thin, 1-1.5 4, smooth, the pore of lower cell at septum; pedicel colorless, equaling the spore or 
in large part deciduous. 
On CaRDUACEAE: 
Zexmenia leucactis Blake, Guatemala. 
Zexmenia longipes Benth., Guatemala. 
TYPE Locarity: San Felipe, Guatemala, on Zexmenia leucactis. 
DisTRIBUTION: Guatemala. 
253. Dicaeoma Oyedaeae (Mayor) Arthur & Jackson. 
Puccinia Oyedaeae Mayor, Mém. Soc. Neuch. Sci. Nat. 5: 535, 1913. 
O. Pycnia epiphyllous, one or few associated with the aecia on slightly swollen areas of 
the leaf, conspicuous, chocolate-brown, globoid, 96-122 by 112-128 y; ostiolar filaments up to 
74 uw long. 
I. Aecia epiphyllous, 1-12 associated with the pycnia in groups 0.3-2 mm. across, cupu- 
late, 0.1-0.2 mm. in diameter, 0.1 mm. high; peridium white, erose; peridial cells linear-oblong 
in longitudinal section, 5—7 by 26-35 u, abutted, the walls 1.5—-2 u thick, the outer smooth, the 
inner closely and finely verrucose; aeciospores broadly ellipsoid, 23-26 by 26—32 w; wall yellow- 
ish, 3 » thick, thickening up to 4-7 » at apex, closely and coarsely tuberculate-verrucose. 
Il. Uredinia bypophyllous, scattered, round, 0.1~0.4 mm. in diameter, early naked, 
pulverulent, dark cinnamon-brown, ruptured epidermis inconspicuous; urediniospores globoid 
or broadly ellipsoid, 23-27 by 26-32 yu; wall dark cinnamon-brown, thick, 2.5-3 uw, closely and 
conically echinulate, the pores 6-10, scattered. 
III. Telia hypophyllous, scattered, round, 0.1-0.5 mm. in diameter, early naked, slightly 
pulverulent, dark golden-brown becoming somewhat cinereous from germination, ruptured 
epidermis inconspicuous; teliospores linear-oblong or elongate-clavate, 16-23 by 61-121 m, 
rounded above, rounded or narrowed below, slightly constricted at septum; wall light golden- 
brown at apex, paler to colorless below, 1 y or less thick, thickened at apex, 10-15 u, smooth; 
pedicel colorless, 42-74 » long; mesospores few, resembling the teliospores, 18-24 by 32-58 x. 
On CarDUACEAE: 2 
Ovyedaea acuminata (Benth.) Benth. & Hook. f., Costa Rica. 
Type LOCALITY: Central Andes, Dept. Antioquia, Colombia, on Ovedaee sp. 
DISTRIBUTION: Costa Rica; also in South America. 
