242 BULLETIN OF THE BUSSEY INSTITUTION, 
on the upper surface of the leaf were sub-epidermal and comparatively 
large. The teleutospores were brownish, on long pedicels, rather 
broadly ovate, only slightly constricted at the septum, and pointed at 
the extremities. They measured from .055 to .075 mm. in length, by 
about .02 mm. in breadth. The teleutospores were not unfrequently 
three and even four celled. The question arises whether this is not 
a form of Puccinia Malvacearum, Mont. It differs in the color of the 
spores, which, in P. Malvacearum, are decidedly yellow, and also more 
slender and acute than in our form. PP. Malvacearum, moreover, is 
not, as far as our experience goes, accompanied by an accidium. The 
spores would warrant us in supposing the species distinct, but, although 
the difference is as great as that ‘found in the case of many species 
supposed to be specifically distinct from one another, yet we must con- 
fess that we cannot help suspecting that the European form with which 
we are familiar, belongs to the same species as the Californian plant. 
We would call the fungus P. Malvacearum var. Malvastri, and consider 
that it differs from the type in having blunter and darker colored 
spores. We found at Wood’s Hole in September, a Puccinia on 
Proserpinaca pectinacea, which in external appearance resembles Puc- 
cinta Epilobit DC., but which differs from it in the shape of the 
spores, which are longer and more acute. We are again in doubt 
whether to call it a new species or a variety of P. Hpilobit. We are 
inclined to favor the latter view. 
The genus of Uredinee, which is most perplexing, is without doubt 
Uromyces. This arises from two reasons. First; because all the 
single-spored Uredinee were formerly placed in the genus Uredo, and 
it is now difficult to say whether any Uromyces is new, because it may 
have been already described by older writers, under the name of a 
Uredo ; and secondly, — and this is a point to which sufficient attention 
does not seem to have been paid by mycologists, — because in some 
species of Puccinia, where the ripe teleutospores are two-celled, there 
occurs an interval when they are unicellular, and it is then impossible 
to say certainly whether we have before us a genuine Uromyces, or the 
undeveloped state of some Puccinia. However easy it may appear 
abstractly to settle this point, in practice it is often difficult; and 
undoubtedly several species of Uromyces have been described from 
what were only undeveloped Puccini@. In this connection, we may 
mention two species found, one on Lrizopyrum spicatum at Falmouth, 
