14 Rhodora [JANUARY 
in certain melampsoraceous genera. A further examination showed 
very small teleutosporic sori, difficult to see, as they are concealed by 
the hairs on the Rubus leaves. I then searched among the unnamed 
uredoes on Rubi, which had gradually accumulated in the herbarium 
and found that the uredo in question was well represented in several 
collections, especially on Rubus neglectus Peck! and also less frequently 
оп R. strigosus. lt was abundant on specimens collected near the 
Bussey Institution in Oct. 1875, and also on specimens from,Newton, 
Mass., in Sept. 1877, in company with a Phragmidium. in Me New- 
ton specimens both uredo and teleutospores were abundant. I have 
also specimens from Arlington, Mass. (В. М. Davis), from Ellis River, 
N. H. (L. M. Underwood), and from Madison, Wis. (W. Trelease), 
not to mention some recent collections. The uredo, which is scattered 
over the under side of the leaves, is at once distinguished by its peculiar 
peridium, which is conical, truncate, and contracted at the very narrow 
mouth, which is surrounded by a crown of from three to six cells, 
whose upper surface is aculeate, while below they are constricted, 
the wall of the lower part being much thickened. Around the base 
of the peridia, which are usually from 80 1-90 y in height and from 
70 u-75 p in diameter at the base, there is a collar formed by the 
ruptured epidermis. "Тһе other cells of the peridium are irregularly 
rhomboidal, nearly transparent so that the spores beneath can be 
seen, and nearly smooth. ‘Those above are longer than those below 
and in well developed specimens they have a more or less linear ar- 
rangement. The spores when young are generally obovoid but fully 
developed and especially the free spores have a very constant-ellip- 
soidal shape, the average being 16-18 м by 11-12 y, some being as 
long as 22 u. "Тһе surface is somewhat rough but not spiny. 
This uredo is the same as the one described by Dietel in Hedwigia 
44, 330, Aug. 1905, of which he gave a characteristic figure. Не 
considered it to be connected with Phragmidium gracile. The host 
is not mentioned but it is probable that Dietel's material came from 
the United States. While it is true that the uredo sometimes occurs 
in company with Phragmidia its real connection is without doubt 
with the teleutospores which I have referred to, for both belong to the 
melampsoric group and furthermore they are found together in cases 
where no Phragmidia are present. The only question seems to me to 
1 I am indebted to Prof, M, І. Fernald for the determination of the species of Rubus 
cited in this paper. 
