Part 8, 1922] AECIDIACEAE 5738 
the pycnia and telia of the two species being morphologically similar, and the hosts the same. 
The two species are undoubtedly of the same origin. 
ON CARDUACEAE: 
Vernonia patens H.B.K., Costa Rica. 
Vernonia sp., Panama. 
_TyPE Locality: Paraguari, Paraguay, on Compositae (Verbesinae?), now interpreted as Ver- 
nonia sp. 
DistTripution: Central America; also in South America. 
122. Micropuccinia discreta (Jackson & Holway) 
Arthur & Jackson. 
Puccinia discreta Jackson & Holway; H.S. Jackson, Bot. Gaz. 65: 309. 1918. 
O. Pyenia epiphyllous, surrounded by the telia, few, gregarious, noticeable, golden- 
brown fading to dark-brown, globose or depressed-globoid, 90-100 by 100-1304; ostiolar 
filaments short. 
Til. Telia chiefly epiphyllous, densely gregarious and confluent in groups 0.5-3 mm. 
across, on yellowish hypertrophied spots, often arranged in a concentric manner around the 
pycnia, roundish or somewhat irregular, 6.2-0.6 mm. across, early naked, at first punctiform, 
becoming pulverulent, dark cinnamon-brown, ruptured epidermis conspicuous; teliospores 
ellipsoid, 18-22 by 32-42 4, rounded at both ends, cells easily separating, strongly constricted 
at septum; wall dark cinnamon-brown, uniform in thickness, 2.5-3.5 4, minutely verrucose- 
rugose, often in lines extending in various directions, the pore of apical cell placed about 
half way from apex to septum, similarly in lower cell; pedicel colorless, usually deciduous. 
On CARDUACEAE: 
Vernonia stellaris Llave & Lex. (V. Deppeana Less.), Costa Rica; Guatemala. 
Type LOCALITY: San José, Costa Rica, on Vernonia Deppeana. 
DistRIBUTION: Central America. 
123. Micropuccinia paupercula (Arth.) Arthur & Jackson. 
Puccinia paupercula Arth. Bot. Gaz. 40: 206. 1905. 
Puccinia Elephantopodis-spicati Pat. Bull. Soc. Myc. Fr. 28: 140. 1912. 
O. Pycnia unknown. 
III. Telia hypophyllous, crowded in orbicular groups 1-4 mm. across, minute, puncti- 
form, confluent, soon naked, compact, chocolate-brown, usually cinereous by germination, 
ruptured epidermis inconspicuous; teliospores oblong or lance-oblong, 15-17 by 39-50 u, 
acute or obtuse at apex, obtuse or narrowed at base, slightly or not constricted at septum; 
wall chestnut-brown, smooth, rather thin, 1-2 », thicker at apex, 7-9 uw, concolorous; pedicel 
colored like the spore, firm, one half length of spore or less. 
ON CARDUACEAE: 
Pseudelephantopus spicatus (Juss.) Rohr (Distrepius spicatus Cass., Elephantopus spicatus 
Juss.), Veracruz; Costa Rica; Guatemala; Panama. 
TyPE LOCALITY: Veracruz, Mexico, on Elephantopus spicatus. 
DistRIBUTION: Southern Mexico and Central America. 
124. Micropuccinia tolimensis (Mayor) Arthur & Jackson. 
Puccinia tolimensis Mayor, Mém. Soc. Neuch. Sci. Nat. 5: 516. 1913. 
O. Pycnia unknown, probably not formed. 
III. Telia hypophyllous, densely gregarious and often confluent, in orbicular groups 
2-5 mm. across, on purplish spots, punctiform, 0.1-0.2 mm. across, tardily naked, compact, 
pulvinate, chocolate-brown, ruptured epidermis conspicuous; teliospores clavate or oblong, 
16-23 by 40-58 w; apex variable, rounded, truncate, or obtuse, base narrowed or rarely some- 
what rounded, usually constricted at septum; wall golden- or light cinnamon-brown, thin, 
lw, thickened and darker at apex, 3-7 », smooth; pedicel fragile, short, colorless or tinted 
like the spore. 
This species is correlated with Dicaeoma Eleocharidis (Arth.) Kuntze, the telial characters 
of the two species being essentially the same and the hosts of the short-cycled species cor- 
responding with the aecial hosts of the heteroecious species. This agreement doubtless in- 
dicates a common origin for the two species. 
