CLINTON: NORTH AMERICAN USTILAGINEAE. 
361 
Setchell has described the germination of Ustilago sphaerogena. 
Hume found that the spores are developed similarly to those of U. 
Crus-galli as described by Magnus. Literature : 87, 162. 
Ustilago Crus-galli Tr. & Earle. 
Ustilago Crus-galli Tr. & Earle, Bull. Torr. Bot. Club, 22 : 175. 1895. 
Cintractia Seymouriana Magn., Ber. I)eut. Bot. Ges.,14: 217. 1896. 
Cintractia Crus-galli Magn., Ber. Deut. Bot. Ges, 14 : 392. 1896. 
Exsiccati: Cintractia Crus-galli (Tr. & Earle) Magn., on Panicum Crus- 
galli , Syd., Ust., 125, 179, Vest., Micr. Rar. Sel., 324, Griff., West Amer. 
Fungi, 212, 212 a ; Ustilago Crus-galli Tr. & Earle, on Panicum Crus-galli, 
Seym. & Earle, Econ. Fungi Clinton Ust. Supp., C 67. 
Sori often encircling stem at nodes or at place of the inflorescence 
infecting both stem and leaves, prominent, often nodular, one to 
several centimeters in length, protected by tough hispid membrane 
which upon rupture discloses olive brown, dusty spore mass ; spores 
ovoid to spherical, occasionally more elongated, rather bluntly 
echinulate or even verruculose, chiefly 10-14 g in length. 
Host: Panicum Crus-galli , Ark., Colo., Conn., Ill., Mass., Minn., 
Ore., S. Dak., Utah (type), Wash. 
This fungus is very closely related to Ustilago sphaerogena which 
occurs in the ovaries of the same host. After an examination of 
all the available material the writer finds that both have the hispid 
covering to the sori and that the outbreaks on the stem often 
closely resemble those in the ovaries in shape and size. There are, 
however, slight differences between their spores, though it is not 
certain these are constant. The spores of Ustilago Crus-galli as a 
rule are more irregular, slightly larger, often darker tinted and less 
abundantly and more bluntly echinulate. Field study may possibly 
show that these species are sometimes associated; though the writer 
has often collected Ustilago sphaerogena in Illinois and New Eng¬ 
land he has never found Ustilago Crus-galli. Magnus has placed 
this latter under the genus Cintractia because of the method of 
spore development. As considered here Cintractia is limited to 
species possessing a different type of spores. The germination of 
the spores has not been described. Literature : 116. 
