CLINTON: NORTH AMERICAN USTILAGINEAE. 
407 
by others, as specimens representing them have not been seen by 
the writer. The specimens seen at least seem to deserve specific 
rank. It differs from C. cixicola not only in the host genus but also 
in the part infected and from C. leucoderma in the position and 
size of the sorus and in its smooth spores. The germination of this 
species has not been reported. Literature: 29, 91. 
Cintractia leucoderma (Berk.) P. Henn. 
Ustilago leucoderma Berk., Ann. Mag. Nat. Hist., n, 9: 200. 1852. 
Cintractia Krugiana Magn., Engl. Jahrb., 17 : 490. 1893. 
Cintractia leucoderma P. Henn., Heclw., 34 : 335. 1895. 
Cintractia affinis Pk., N. Y. St. Mus. Bull., 67 : 28-29. 1903. 
Exsiccati: Cintractia leucoderma (Berk.) P. Henn., on Rhynchospora sp., 
Syd., Ust., 224. 
Sori surrounding peduncles or pedicles or often involving base of 
the rhachis (sometimes even on stems) forming conspicuous elon¬ 
gated bodies 7-30 mm. in length, covered with a thick white false 
membrane that gradually flakes away leaving exposed the firmly 
agglutinated black spore mass; sterile cells more or less gelatinized, 
often almost in fragments; spores medium to dark reddish brown, 
somewhat compressed laterally and so showing oblong to circular 
according to view, occasionally obtusely angled, at times with 
hyaline fragments still attached, verruculose 1 though sometimes 
rather obscurely, 13-16 /x, rarely 18 /x or even 20 /x in length. 
Hosts : RhyncZiospora corniculata, , Fla.; R. cyperoides , Fla.; R. 
gigantea , Porto Rico (type C. Krugiana) ; R. macrostacZiya, N. Y. 
(type C. affinis); R. Tracyi , Fla.; RZiyncZcospora sp., Mex.; RZiyn- 
chospora ?, Cuba, San Dom. (type). 
The false membrane of the sorus is developed most conspicuously 
in this of any of the species. The specimen collected by Peck and 
Earle at Smithtown, Long Island ( Cintractia affinis), has spores 
that average larger than most of the other collections, being 16-20 g 
in length; but its variations do not seem to merit specific distinc¬ 
tion more than some of the other collections. The germination of 
the species has not been reported. Literature: 23, 113. 
1 In the Florida specimens the exospore is provided with conspicuous par¬ 
allel striae that toward the poles often become broken into verruculations. As 
some hint of this banded appearance is often seen in other specimens, it is 
not probable that this represents a distinct species. 
