ARTHUR: NEW SPECIES OF UREDINEAE—XIV IgI 
ii, ITI, H. F. Bain, communicated by John A. Stevenson 5812 
(type). 
The urediniospores of this interesting species are much 
larger and more prominently verrucose than those of the common 
form in Europe, M. (Chrysomyxa) Rhododendri. This is the 
first rust on Rhododendron seen from the eastern United States, 
although the European species has been ascribed to this country 
by a number of authors. Duggar says (Fungous Diseases 432. 
1909), ‘‘In the United States this fungus is particularly common 
in the mountains of the east, and southward as far as the southern 
limits of the Appalachians.’’ The statement does not apply to 
any true rust on Rhododendron. Roan Mountain and LeConte 
Mountain are about 100 miles apart. The rust was reported 
abundant on the summit of LeConte Mountain. Mycologists 
who visit the summits of these mountains and those nearby 
should be on the lookout for the aecia, which may be expected 
to occur on species of Picea. 
Cronartium stalactiforme Arthur & Kern, comb. nov. 
Peridermium stalactiforme Arth. & Kern, Ball. Torrey Club 
33: 419. 1906 
This Cronartium belongs to a group of three species which 
have been much confused, both in nomenclature and in structural 
characters. All three species have uredinia and telia on Castilleja 
and related genera of scrophulariaceous hosts, which are difficult 
to distinguish except by means of cultures. The aecia of the 
three species, however, occuring on pine trunks and branches, 
can be identified with considerable certainty, even by their gross 
appearance. The aecia of C. stalactiforme are confined to the bark 
and do not produce woody galls. They often extend over con- 
siderable areas, and cause little or no swelling. The individual 
aecia are low and flattened, with a circumscissile dehiscence. 
Cronartium filamentosum (Peck) Hedge. (Peridermium fila- 
mentosum Peck, 1882) is similar to C. stalactiforme in the effect 
upon the host, but the individual aecia are more elongated, 
often becoming cylindric, and have noticeable filaments extend- 
ing from top to bottom through the individual aecia. There are 
only rudiments of such filaments in C. stalactiforme 
Cronartium coleosporioides (Diet. & Holw.) Arth. (Perider- 
mium Harknessit Moore, 1876) differs from the two preceding 
species by producing a woody gall, often of considerable size and 
