THE UREDINALES FOUND UPON THE ONAGRACEAE 
555 
Doubtful Species 
17. PucciNiA SPHAEROIDEA P. Henn. Hedwigia 42: (107). 1903. 
Literature: Sydow, Monogr. Ured. i: 890. 1904. Saccardo, Syll. Fung. 17: 
348. 1905. Holway, N. Amer. Ured. i: 72. 1907. 
This Species, cited as upon Jussiaea sp., Lower California, differs 
markedly from any other rust upon the Onagraceae. The collection 
by Purpus, 1902, is the only one known. The specimen represented 
in the herbarium here is very fragmentary. The teliospores are ovoid, 
the wall uniformly thick, the pedicel persistent, often inserted laterally. 
These teliospores exactly resemble those of Puccinia sphaerospora 
Sydow and Henn., the hosts of which are Asclepiadaceous plants. 
Sections of the material indicate that the host is quite likely in reality 
some Asclepiad. The characteristic spores point strikingly toward 
such a conclusion. On the whole, this species seems most doubtfully 
to belong with the Onagraceous rusts. 
Excluded Species 
Puccinia columbensis Ell. & Ev. Proc Acad. Phila. 1893. 153. 
1893. 
Stated to be upon Oenothera biennis. Holway, Journ. Mycol. 8: 
171. 1902, points out that the host of this Puccinia is Troximon, not 
Oenothera. An Aecidium labeled as upon the same host, proved to 
be upon SoUdago mollis and the rust is described by Arthur, Bull. 
Torrey Club 31: 7-8. 1904, as Aecidium recedens. See also Sydow, 
Monogr. Ured. i: 869. 1904. 
Uromyces intricatus Cooke, Grev. 7: 3. 1878. 
Stated to be upon Gayophytum ramosissimum. The host, how- 
ever, proves to be Eriogonum. See N. Amer. Fl. 7: 244-245. 1912. 
During the progress of this study. Professor Jackson obtained from 
the phanerogamic herbarium of the Field Museum, Chicago, a specimen 
(on Jussiaea sp., marsh land near Ferry River, vicinity of Kingston, 
Jamaica, Sept. 11-12, J906, N. L. Britton, No. 397) which bears a 
very few small uredinial sori. The urediniospores are ellipsoid, 19-23 
by 26-29 iJL, the walls golden-brown, 1-2 /x thick, moderately echinu- 
late, with equatorial pores. The known Jussiaea rusts are not 
believed to have an uredinial stage, but some Onagraceous rust, as 
for instance Uromyces plumbarius, may possibly occur upon Jussiaea. 
