1896] BRIEFER ARTICLES 255 
not completely, breaks down all generic differences between these two 
genera. The prominent tubercles in no definite arrangement and the 
deep groove extending almost if not quite to the axil would denote it 
to be a Mamillaria ; on the other hand, the exceedingly robust spines 
and the scales on the ovary are characteristic of the genus Echinocac- 
tus. It seems, however, to agree more closely with the genus Mamil- 
laria as at present understood.—J. W. Toumey, University of Arizona. 
THE DISTRIBUTION OF THE SPECIES OF GYMNO- 
SPORANGIUM IN THE SOUTH. 
Ir is a somewhat remarkable fact that no less than six very distinct 
species of Gymnosporangium are parasitic on Juniperus Virginiana. 
These species are all found in the states bordering on the Gulf of 
Mexico, and so far as present data indicate, two of them are peculiar 
to this region. The other species are of much wider distribution, but 
we still lack reliable information regarding the extent of range of any 
of the species of the genus. The species may be arranged in groups 
as follows : | 
Producing somewhat globose galls. 
Perennial species. 
Gymnosporangium globosum Farlow. 
Gymnosporangium Bermudianum (Farlow) Earle. 
Annual species. 
Gymnosporangium macropus Link. 
Gymnosporangium sp? 
Producing slight enlargement of stems or fasciation of branchlets. 
Perennial species. 
Gymnosporangium clavipes Cooke & Peck. 
Gymnosporangium nidus-avis Thaxter. 
. tins Gymnosporangiun macropus a the most so 
crab and si nae distributed, its roestelia occurring * the wi 
i € cultivated apple. We have also found it during the past 
Sila ee a growing on Crategus spathulata. Its general distri- 
since its ao tless coextensive with the wide distribution of its host, 
st common alternate host is as widely cultivated. In the 
1 * 
oe sama “ . seo! and description to this species has been left : a 
*erifications of Shalem are indebted for numerous comparisons of materia 
ng the past year. 
