ARTHUR: NEW SPECIES OF UREDINEAE 147 
I. Aecia hypophyllous, usually few in somewhat indefinite 
groups opposite the pycnia, cylindric, 0.3-0.5 mm. long, 0.1-0.2 
mm. in diameter; peridium erect, erose; peridial cells rhombic or 
rectangular, abutted or somewhat overlapping, 15-23 by 18-27 n, 
the outer wall thick, 10-15 n, transversely striate, smooth, the 
inner wall much thinner, 2-3, coarsely verrucose; aeciospores 
globoid or ellipsoid, 13-16 by 16-20 u: wall colorless, thin, I-1.5 u, 
finely and closely verrucose. 
III. Telia hypophyllous, scattered among the groups of aecia, 
round, early naked, pulvinate, chestnut-brown, ruptured epider- 
mis inconspicuous; teliospores oblong, 10-14 by 40-48 yu, obtuse or 
rounded at both ends, slightly constricted at septum; wall dark 
cinnamon-brown, 1.5-2 4 thick, much thicker above, 5-9u, smooth; 
pedicel short, more or less tinted. 
On Ranunculus recurvatus Poir., Creve Coeur Lake, Missouri, 
May, 1887, L. H. Pammel. The collection came to the writer’s 
attention ten years ago, when consulting the cryptogamic her- 
barium of the New York Botanical Garden. It was there labelled 
Aecidium ranunculacearum, and was for a long time considered one 
of the common heteroecious aecia belonging to grass rusts. When 
critically examined, however, it was found that the abundant 
aecia differed somewhat from those belonging to grasses, and were 
accompanied by telia, which had before been overlooked. It is 
remarkable that no other similar collection has turned up in the 
thirty years since it was gathered. 
Puccinia obesispora sp. nov. 
II. Uredinia chiefly hypophyllous, confluent on discolored 
spots, often in rings about a central area that becomes dry and 
dead, or scattered, early naked, cinnamon-brown, ruptured epi- 
dermis prominent; urediniospores broadly ellipsoid or globoid, 
19-26 by 24-30 u; wall variable in thickness, 1.5-3 u, dark cinna- 
mon-brown, sparsely and strongly echinulate, the pores 2, equa- 
torial. 
__ If. Telia chiefly hypophyllous, scattered, usually following 
the uredinia, irregular in outline, 0.I-0.5 mm. across, early naked, 
dark chocolate-brown; teliospores ellipsoid or oblong, large, 26-35 
by 55-70, rounded at both ends, or obtuse or even acute above, 
slightly or not constricted at septum; wall chocolate-brown, thick; 
3-4, much thicker above, 6-12 4, coarsely and rather sparsely 
verrucose; pedicel tinted near the spore, and twice length of spore, 
or less. 
