208 GRIFFITHS: CONCERNING SOME WEST AMERICAN FUNGI 
brown to almost opaque by transmitted light ; epispore thin, 
smooth, contents granular, which is obscured at maturity 
On Microchloa indica (L.) Kuntze, on the deserts near San 
Luis Potosi, Mexico, June, 1904. The species is common in the 
San Luis Potosi and Aguas Calientes region. 
Ustitaco BoutetouaE K. & S. 
This species, which is not at all well represented in collections, 
appears to be quite common, and even abundant, in certain locali- 
ties. My experience with it indicates that it is at home in high 
altitudes. In 1904, large quantities of it were found in the San 
Francisco Mountains of Arizona, at an altitude of about 7500 feet, 
upon Louteloua prostrata Lag. Large areas were found where 
practically all of the plants were affected. Other collections have 
been made near the City of Zacatecas, Mexico, at an altitude of 
nearly 8,000 feet, and the species has been seen in several situa- 
tions in the Federal District of Mexico on the same host. My 
material has somewhat larger and darker-colored spores than 
specimens which have been examined upon Bouteloua oligostachya 
from Kansas. 
UsTILAGO HETEROGENA P. Henn. 
This species appears from my collections to be exceedingly 
variable in spore-characters, especially in so far as color and echin- 
ulation are concerned. Several collections have been made on 
Leptochloa mucronata and on L. viscida, all from the general 
region extending from twenty miles south of Altar, in the Mexican 
state of Sonora, to Tucson, Arizona. It is quite frequent in this 
region. 
Ustitaco Cynopontis P. Henn. 
So far as I know this is the first record of this species for this 
country. It corresponds perfectly with the original description, as 
well as with the specimen in Sydow’s Ustilagineen wo. jog. it 
appears to be most closely related to Ustilago hypodytes (Schl.) 
Fr. It has not been seen except at Santa Rosa, California, in 
1905. Here it was the exception rather than the rule to find 
Bermuda grass (Cynodon dactylon Pers.) lawns free from this smut. 
In many instances it would have been difficult to find unaffected 
plants. In the majority of cases seed-production was practically 
destroyed by it. 
