56 ARTHUR: NEW SPECIES OF UREDINEAE—XV 
fern rust to be referred to the genus Dicaeoma, and is undoubtedly 
heteroecious. The pale color of the teliospore-walls and the 
generally oblique septum remind one of species in Desmella. It 
can scarcely be doubted that we have in this species the most 
primitive form yet known in the great genus Dicaeoma. 
Puccinia ecuadorensis sp. nov. 
II. Uredinia hypophyllous, scattered or somewhat grouped, 
roundish, applanate, 0.2-0.4 mm. across, early naked, pulveru- 
lent, cinnamon-brown, ruptured epidermis evident; uredinio- 
spores globoid, 23-30 in diameter; wall cinnamon- or golden- 
brown, moderately thick, 1.5-3y, sparsely and prominently 
verrucose-echinulate, the pores evident, usually 6, scattered. 
III. Telia hypophyllous, similar to the uredinia; teliospores 
oblong or clavate-oblong, 19-23 by 42-48u, rounded or obtuse 
above, narrowed below, somewhat constricted at septum; wall 
pale cinnamon-brown, thi n, u, thicker above, 3-5 u, smooth; 
1.5 
auntie nearly or quite aioe slender, as long as spore or less. 
On Wedelia sp. ( Carduaceae), vicinity of Guayaquil, Ecuador, 
August 11, 1918, II, iii, J. N. & Geo. Rose 22113. The general 
aspect of this rust is similar to that of Puccinia Helianthi Schw.., 
but the urediniospores and teliospores appear abundantly 
distinct. The available material is scanty, and only a few old 
telia were found, all upon one leaf. All of the teliospores had 
germinated, and were more or less collapsed. The uredinio- 
spores are remarkable in having a number of scattered pores; 
most of the rusts known on the tribe Heliantheae have but two 
equatorial pores. 
Puccinia minuscula sp. nov. 
O. Pycnia epiphyllous, subepidermal, ae T10-128 yp in 
diameter; ostiolar filaments long and prominen 
1; Aecia hypophyllous, in groups 2 to 3 mm. across, brie 
much discoloration, cylin dric or cupulate, 0.3-0.5 
diameter; peridial cells in face view oblong: poietse: ey 
by 35-48, prominently verrucose, in section linear, 7-9 by 
crib 45 u, scarcely overlapping, the outer wall ve oe et in, about Ip, 
e inner wall slightly thicker, 1.5-2, verrucose; aecio- 
cies ellipsoid, 19-26 by 30-35; wall colorless, thin, about 1 Ip, 
coarsely verrucose, reticulate, or reticulately ru ‘ 
II. Uredinia Jypephylion:. thickly sc catered, round, 0.3- 
0.5 mm. in diameter, soon n aked, applanate, cinnamon-brown, 
pulverulent, ruptu ured enileniia inconspicuous; urediniospores 
broadly ellipsoid or globoid, 23-26 by 26-29 y; wall light cinna- 
