348 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
sionally irregular, thin walled, with coarse granules giving granular 
reticulate appearance under an immersion, usually 5.5-8.5 /z, some¬ 
times even 11 /z in length. 
Hosts: Danthonia compressa , N. Y; D. intermedia , Calif., 
Wyo.; D. spicata, N. H. (type); D. unispicata, Calif.; Danthonia 
sp., Colo. 
This is near Ustilago Tritici but has spores more granular reticu¬ 
late, averaging larger and not lighter colored on one side. It is 
one of the forms that have been included under the old species 
Ustilago segetum. Ustilago Danthoniae Kalchb., if described 
accurately, differs decidedly in its much larger spores. Apparently 
the germination of the spores has not been described. Literature : 29. 
Ustilago affinis Ell. & Ev. 
Ustilago affinis Ell. & Ev., Bull. Torr. Bot. Club, 20 : 297. 1893. 
? Ustilago Hilariae P. Ilenn., Hedw., 37: 267. 1898. 
Ustilago Stenotaphri P. Henn., Hedw., 37: 293. 1898. 
Ustilago Americana Speg., Fung. Argent. Nov. Yel Crit. N., 375. 1899. 
Ustilago Stenotaphri Massee, Kew Bull., 153-154 : 184. 1899. 
Ustilago Henningsii Sacc. & Syd., Syll. Fung., 16 : 368. 1902. 
Sori in spikelets, usually infecting all which are sometimes slightly 
merged, at first more or less hidden by enveloping leaves, protected 
by thin transparent membrane but this soon rupturing and olive 
brown spore mass scattering until there remains only the naked 
rhachis; spores light reddish brown, oblong or ovate to chiefly sub- 
spherical or spherical, often slightly angled, smooth, 5.5-9 /z in 
length. 
Hosts: Hilaria cenchroides , Mex. (type U Hilariae ); Steno- 
taphrurn Americanum , Bermuda, Jamaica (type). 
McAlpine, in 1895, first used the name Ustilago Stenotaphri but 
apparently for an entirely different smut from that described here; 
later both Hennings and Massee used the same name for this species 
in describing species they thought were new. Ustilago Hilariae of 
Hennings hardly seems distinct from the form on Stenotaphrum, the 
spores being alike unless the latter may be a little lighter colored. 
The germination has not been reported. Literature : 29. 
