CLINTON: NORTH AMERICAN USTILAGINEAE. 
353 
from younger specimens than those yet seen. The form on P. 
saccharatum from Arizona doubtfully comes here, as its spores aver¬ 
age larger (7-10 g) . Brefeld reported the germination of this spe¬ 
cies : 23. 
Ustilago Ulei P. Henn. 
Ustilago Ulei P. Henn., Hedw., 34: 88-89. 1895. 
Sori in the leaves, rather indefinite, in striae or often involving 
more or less of the inner surface of the blades as folded together, 
eventually causing them to become somewhat shredded and the 
olive black dusty spore mass to become scattered ; spores reddish 
brown, often with thin walls (such spores easily collapsing when 
dry) usually subspherical or spherical, smooth or very minutely 
punctate verruculose, 8-11 g in diameter. 
Host: Chloris submutiea , Mex. 
Hennings described this species from specimens collected by Ule 
in Brazil and states that the spores are smooth, which seems to be 
usuallv the case with this collection. The collection listed here 
«/ 
from Mexico was identified by Hennings to be this species. The 
spores in this case, however, are evidently but minutely punctate- 
verruculose and it is difficult to decide whether it belongs under 
this species or Ustilago chloridicola Henn., which possesses punc¬ 
tate-reticulate spores. The writer has seen only fragmentary spec¬ 
imens of these three collections and a further study with more 
material might show that the two species are merely variations of 
the same thing. Brefeld has described the germination of the spe¬ 
cies given here: 23. 
Ustilago chloridicola P. Henn. 
Ustilago chloridicola P. Henn., Heclw., 37 : 267. 1898. 
Sori in the inflorescence, linear, often about 3 cm. in length, caus¬ 
ing more or less shredding of the infected tissues, with dusty olive 
black spore mass that becomes scattered ; spores reddish brown, 
often irregular, oblong or elliptical to spherical, apparently minutely 
verruculose but really under an immersion lens showing punctate- 
reticulate, 6-11 g in length. 
Host: Chloris sp., Calif, (type). 
This species is very closely related to Ustilago Ulei , especially 
