34 ARTHUR: NEW SPECIES OF UREDINEAE 
Big Bear Lake, California, July 31, 1920, and August I, 1920 
(type); all collected by E. Bethel, and all showing O, I, and III. 
The first specimen received from Mr. Bethel was sent as an 
Aecidium, “with Uromyces which appears to belong with it.’’ 
With the collection of August 1 he inclosed this note: ‘‘From field 
observations I am confident that this Aecidiwm is followed by the 
Uromyces.”” The specimens sent by Mr. Bethel show clearly 
that the telia arise from the same mycelium that bore the aecia, 
as most of the telial sori are contained in the aecial cups. 
The aecia are morphologically indistinguishable from those 
occurring commonly on the same host and similar hosts throughout 
the Rocky Mountains, and which the writer for a time referred to 
Aecidium Tithymali Arth. (this name to be restricted to forms. 
occurring east of the Rockies), but now believes to be the aecial 
stage of the heteroecious Uromyces occidentalis Sydow. 
The teliospores of U. coérdinatus are indistinguishable from 
those of U. occidentalis on species of Lupinus in the same region. 
Farther east in the Rockies, however, teliospores of this lupine 
rust are often slightly smaller and paler. The connection of the 
common Rocky Mountain aecia on Tithymalus, not followed by 
any other spore forms on the same host, with the Uromyces occi- 
dentalis on Lupinus was first pointed out by Mr. A. O. Garrett 
some three years ago in a letter to the writer, and backed by strong 
circumstantial evidence. Later Mr. E. Bethel supplied data and 
independently reached the same conclusion. Although this con- 
nection has not yet been established by cultures, it seems reason- 
ably certain. 
The teliospores are also scarcely distinguishable from Uromyces 
Tranzschelii Sydow, a short cycle form on the same and similar 
species of Tithymalus. These three species of rusts with different 
life cycles, form a most interesting group of codrdinated species, 
which eventually under some other classification may possibly be 
placed under a single name. 
Polythelis suffusca (Holway) comb. nov. 
Puccinia Pulsatillae Rostr. Cat. Pl. Soc. Bot. Copenhague I, 
- hyponym. 1881; Vesterg. Bot. Notiser 1902: 169. 1902. 
Not P. Pulsatillae Kalchbr. 1865. 
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