370 ARTHUR: NEW SPECIES OF UREDINEAE 
teristic species were easily worked out. All the shoots from the 
perennial roots of the host are invaded and altered by the game- 
tophytic hyphae, showing that the mycelium probably hibernates 
in the crown of the plant. The sporophytic phase was not so well 
represented by the collection, and probably has a limited mycelium. 
-Puccinia exornata sp. nov. 
O. Pycnia amphigenous, in small groups, large but sunken 
in the tissues and not especially conspicuous, geo—160y in diameter, 
honey-yellow. 
I. Aecia hypophyllous, in small groups surrounding the 
pycnia, on discolored and unthickened spots, roundish, 0.3-0.5 mm. 
in diameter, ruptured epidermis overarching, conspicuous; perid- 
ium wanting; aeciospores globoid, 24-27 by 26-32y; wall colorless, 
3-5z thick, coarsely verrucose with closely set oval beads arranged 
in longitudinal or slightly spiral series. 
Uredinia hypophyllous, scattered or somewhat grouped, 
round, 0.1-0.2 mm. across, soon naked, low, pulverulent, pale 
cinnamon-brown, ruptured epidermis inconspicuous; uredinio- 
spores globoid or obovate-ellipsoid, 20-24 by 24-30u; wall thin, 
I-I.5u, very pale yellow, finely and sparsely echinulate, pores 
indistinct, apparently 3 and nearly equatorial. 
III. Telia hypophyllous, similar to the uredinia but slightly 
larger and darker in color; teliospores oblong, 19-24 by 37-48u, 
round at both ends, somewhat constricted at septum; wall golden 
yellow, smooth, 1 thick, slightly thicker above, 2—4u; pedicel 
colorless, slender, once to twice the length of spore. 
On Baccharis thesioides H.B.K., Guatemala City, Dept. of 
Guatemala, Guatemala, alt. 1465 m., Feb. 2, 1905, W. A. Keller- 
man 5308. The uredinia and telia of this species are very similar 
to those of Puccinia oaxacana Diet. & Holw., but the aecia are 
wholly unlike, especially in the absence of a peridium and in the 
coarsely sculptured and_ thick-walled aeciospores. The _ host, 
Kellerman 4375, was determined by Mr. J. Donnell Smith. 
Puccinia egregia sp. nov. 
- Pycnia hypophyllous, numerous, especially along the 
veins, preceding the aecia, inconspicuous. 
Aecia hypophyllous and caulicolous, abundant, scattered 
over the whole plant from a diffused mycelium, causing etiolation, 
at first more numerous along the stems and veins, mostly oval, 
