CLINTON: NORTH AMERICAN USTILAGINEAE. 
417 
chiefly 40-80 /x in length ; spores dark reddish brown, ovoid to 
spherical or polyhedral, smooth, about 12-17 gin length. 
Hosts: jStipa comata , Wyo.; S. viridula, Col. (type). 
The species has some points in common with TJrocystis granulosa 
which also occurs on Stipa as a host. From the only two collec¬ 
tions that have been made of these fungi, however, their differences 
are much more prominent than their resemblances. The Sorospo- 
rium has little or no evidence of a sterile layer of cells surrounding 
the spores, while with the Urocystis these cells are prominent. The 
character of the sori and the number of spores in the spore balls 
are also points of difference. The spore balls in each are firmly 
agglutinated and the spores present no special points of difference. 
The germination of this Sorosporium is not known. 
Sorosporium Rhynchosporae P. Henn. 
Sorosporium Rhynchosporae P. Henn., Hedw., 35 : 222. 1896. 
Sori in ovaries, completely concealed by the glumes, more or less 
subspherical, about 1 or 2 mm. in length, forming a granular black 
spore mass; spore balls dark reddish to black brown, opaque, 
oblong to subspherical, more or less angular, rather firmly aggluti¬ 
nated, usually of about 6-20 spores, 25-45 g in length; spores dark 
reddish brown, oblong to spherical, with sides more or less angled, 
apparently smooth or obscurely verrucose, chiefly 10-16 /x in length. 
Host: Rhynchospora semiplnmosa , Miss. 
This South American species has been reported but once in this 
country. It agrees fairly well with the type specimens. The 
species would be taken for a Cintractia if the spores were not in 
balls. As yet the germination has not been made out. 
Thecaphora Fingerh. 
Linnaea, 10 : 230. 1836. 
(Poikilosporium Diet., Flora, 83 : 87. 1897.) 
Type : Thecaphora liyalina Fingerh. 
Host : Convolvulus septum. Eur. 
Sori in various parts of the host, often as indefinite masses in the 
floral parts or forming rather firm pustules on the stem, at maturity 
