Gelehrte Gesellschaften. 
459 
from macropus were tinged with greenish and preceded in every 
case by yellowish discolorations. G. globosum produced the brigh- 
test and most luxuriant spermogonia of all, yet, as already stated, 
though appearing on four distinct hosts, they produced no aecidia, and 
it is impossible eyen to guess with what Roestelia it is connected. 
As regards the different species of Gymnosporangium, little 
need be said, since they are all readily separable. As stated by Prof. 
Farlow, G. conicum, preyiously referred to clavipes, must, be 
added to our list of species. It is very common in this vicinity, form- 
ing the familiär bird’s-nest distortions on Juniperus Virginia na 
appearing on the leaves and stem, and apparently identical with the 
European form on J. communis, though as yet it has not been ob- 
seryed upon this host in America. 
G. clavipes, although a very common species in this vicinity 
on J. Virginiana, and further eastward on J. communis, is more 
likely to escape notice than other Gymnosporangia, from the fact 
that the distortion produced is inconspicuous ; while the sporiferous 
masses, although more brightly colored than in the other species, are 
small and only slightly protruced when moist. The spores arc cha- 
racteristic, from their rounded outline and inflated pedicels, the latter 
as broad as the spores themselves, together with their peculiar method 
of germination, which takes place invariably from either extremity, 
as was shown by a large number of cultures in which no exception 
was noticed. 
G. clavariaeforme I have found common in this vicinity 
where J. communis occurs, and further to the eastward in great 
abundauce; as at Kittery, where it is often difficult to find a juniper 
that is free from its attack. It precedes the other species in its date 
of maturity. 
If my eonclusions regarding its Roestelia are correet, G. ma- 
cropus must be regarded as autonomous, thus disposing ofSchroe- 
ter’s theory of its identity with clavariaeforme, which seems, 
however, scarcely tenable on other grounds. 
G. biseptatum appears to be common wherever C. thyoides 
occurs, and I found its distox-tions abundant at Greenlaud, N. H., near 
Portsmouth. 
G. Ellisii, besides its well-known peculiarities of structure, dif- 
fers from the other species in its dato of maturity, which is later than 
any of the others. At Greenlaud, where it occurred together with the 
last-mentioned species, it was in the best condition for cultures about 
June 10, and in the vicinity of Boston perhaps a week earlier. 
A comparison of the geographical ränge of the Gymnosporan- 
gia and Roesteliae in those localities w r here I have had an oppor- 
tunity of observing them is not as instructive in indicating their rela- 
tions as one might suppose, and often the reverse is true. 
At Kittery, for instance, a locality on the sea-shore at the south- 
ernmost point of Maine, there is a certain correspondence, the form 
lacerata, x, with cl a v ar i a e f o r m e, and aurantiaca with cla- 
vipes, being the most abundant. R. cornuta, if I rightly refer 
to this species the form found on Pyrus arbutifolia and Cra- 
30 * 
