244 BOTANICAL GAZETTE. 
The resting spores are more numerous in a cell than in any other species. 
I have frequently counted as many as 25, and in some cases the number is un: 
doubtedly greater. The spores are pretty uniform in size, and are spherical or 
flattened on one side. The epispore is brown, about .004mm. thick, and very 
brittle, so that it is easily split and separated from the endospore, which has a 
thin wall, about .0015mm. thick, and yellow oily contents. When the spores 
are young the epispores closely envelop the endospores, but when mature it is 
generally the case that the endospore and its contents lie loose in the epispore, 
thus reminding one of the oospores of Peronosporee. I have never found sori 
in this species. 
This parasite was first found by Mr. T. M. Peters on Sanicula in Alabama, 
in 1853, and sent to Curtis, who called it Uredo pluriannulata. It was first de- 
seribed in Grevillea, iii, p. 57, December, 1874, as Uromyces pluriannulatus B. & 
C. The original specimen of Peters which I have examined has exactly the 
structure of specimens received from Illinois, collected by Mr. C. A. Hart. 
have also, through the kindness of Dr. W. H. Harkness, examined specimens 
from the present species. 
Besides the forms mentioned above, a Synchytrium occurs 00 
Draba Lyallii, 8. Watson, in the Sierra Nevada, but my material 
18 too scanty to warrant a specific description. In my smal 
specimen the leaf is much swollen and irregularly distorted, and 
a section shows large elliptical resting spores, .13-.18mm. by 
08-.10mm., in elliptical host-cells which are closely aggregated 
and project slightly at the surface of the leaves. It may be that 
this is only a form of S. dureum, known to occur on Cardamine 
pratensis, L.., but all the resting spores which I have seen were 
elliptical, and not globose. With regard to the Synchytrwm 
which occurs near Cambridge on Marrubium vulgare, on the 
leaves of which it 
to the account i my paper in the Bussey Bulletin. 
ven in 
Spherical bodies about -06-.075mm. in diameter, which are 4p 
parently the resting spores of a Synchytrium, are contained in ep! 
dermal eells which enlarge in the tissue of the leaf but do not 
protrude beyond the surface, in this respect resembling the form 
described on Maleothriz It would be rash to give a name to # 
parasite of which so little ig known. 
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