March 1905] Cultures of Uredmeae in 1904 . 
63 
were mentioned as bearing teleutospores a year ago, and stand¬ 
ing near aecidium-laden bushes of Dirca palustris. Last year’s 
supposed results, which were based on a single sowing of 
aecidiospores, can be explained by supposing that the Bromus 
plants w r ere already infected when brought into the laboratory. 
The above plentiful data show no escape from the conclusion 
that the common Bromus rust belongs to the aecidium on 
Clematis Virginiana, and not to the aecidium on Dirca palus¬ 
tris. The name Puccinia hydnoidea (B. & C.) Arth., therefore, 
does not belong to the Bromus rust, but to some teleutosporic 
form not yet identified. The descriptions of uredospores and 
teleutospores given at the place cited belong to Puccinia tomi- 
para Trel. 
There are at least three species of aecidia found upon Cle¬ 
matis in the United States. Aecidium occidentale Arth. occurs 
on C. Douglasii in the northwestern region; its teleutosporic 
connection is not known. Aecidium Clematidis DC., found on 
C. ligusticifolia, C. Scottii, C. Premontii, C. Drummondii, C. 
lasiantha and C. Viorna, ranging from Iowa to Montana and 
southwestward to the Pacific coast, is the first stage of Puc- 
cinnia Agropyri E. & E. The third species is Aecidium Cle- 
matitis Schw., the one under consideration, found on C. Vir¬ 
giniana, ranging throughout the United States and Canada east 
of the Rocky mountains, and belongs to Puccinia tomipara Trel. 
It has larger spermogonia, and somewhat smaller aecidia and 
aecidiospores than that of P. Agropyri. It may be characterized 
as follows: 
Aecidium Clematitis Schw. 
0. Spermogonia epiphyllous, in small groups, honey-yellow, puncti- 
form, subepidermal, globose, 90-140 v in diameter; ostiolar filaments 
40-60 n long. 
I. Aecidia hypophyllous, in orbicular groups, crowded; peridia low, 
margin somewhat revolute, erose; aecidiospores globoid, 16-22 by 18-26 
wall rather thin, 2 colorless, minutely verrucose. 
The teleutospores used in the cultures were all of the nor¬ 
mal two-celled form. The original collection on which the name 
was based does not appear to differ in any appreciable way from 
the usual two-celled form except in the many-celled teleutospores, 
which appear to be variations not uncommon in many grass 
species. The hosts of all three collections used in the cultures 
were of the form often made a distinct species under the name 
Bromus purgans L., which differs but slightly, chiefly in pubes¬ 
cence, from the typical B. ciliatus. 
3. Puccinia Stipae Arth. — On May 9, 1903, I found 
at Spirit Lake, Iowa, spermogonia and young aecidia on leaves 
near the ground of Aster multidorus, with germinated teleuto¬ 
spores on old leaves of Stipa spartea within a few feet, and no 
other grass or sedge rust noticeable for a considerable distance 
