438 
J. C. ARTHUR 
The uredinia of this species are sparingly formed, although uredin- 
iospores are abundant, being produced along with the teliospores. 
The aecia are unaccompanied by pycnia and seem to be secondary 
aecia. In these respects the species is like U. ornatipes Arth. on Loran- 
thus Sonorae. In U. circumscriptiis Neger and U. Urhanianus P. 
Henn., both on Loranthaceae from South America, no urediniospores 
have been recorded. This rust differs materially from U. ornatipes 
by absence of transverse wrinkling in the telial pedicels and by larger 
and differently shaped urediniospores. It differs from U. circumscrip- 
tiis and U. Urhanianus by the rugose sculpturing of the teliospores in 
addtion to the verrucose markings, as well as in the presence of uredinia. 
73. Uromyces Iresines Lagerh. (on Amaranthaceae). 
Iresine Celosia L. (/. celosioides L.), Solola, Jan. 28, 1915, I, III, 
141; Aguas Amargas, Dept. Quezaltenango, Jan. 30, 1917, I, 
III, 803. 
A description of this species was first published by Sydow in his 
Monog. Ured. 2: 227. 1910, from material collected by Lagerheim in 
Ecuador, on an undetermined Iresine, only teliospores being seen. 
Mention was made of its resemblance to a leptoform. The telia are 
very pale, almost colorless, and the spores germinate freely in the sorus. 
Ferdinandsen and Winge in their account of the fungi of the Virgin 
Islands, then the Danish West Indies (Bot. Tidskr. 29: 8. 1908), 
speak of "unripe" teliospores, in connection with Puccinia macropoda 
Speg. on Iresine elatior, which upon examination prove to be this 
species. The specimen came from the island of St. Thomas, and shows 
only telia. 
The present material shows an especially fine development of the 
species. In both gatherings there are aecia, at first appearing in 
epiphyllous groups, which later become surrounded by telia on either 
or on both surfaces. Telia also occur independent of aecia. Where 
both forms occur together they are on pale spots, 2-6 mm. across, and 
are so unmistakably from the same mycelium that in spite of the lepto- 
form of the telia they must be considered stages of one and the same 
species. No pycnia could be detected, even in the youngest stages of 
development. The aecia may be described as follows: 
Aecia epiphyllous, gregarious on pale spots, 2-4 mm. across, 
round, about 0.2 mm. across, opening by a pore, in cross section defi- 
nitely globoid, 190-220 fjL in diameter, surrounded and overarched by 
the host tissue; peridium wanting; aeciospores irregularly ellipsoid, 
