CLINTON: NORTH AMERICAN USTILAGINEAE. 
445 
Sori usually in the leaves or stem, forming dark colored often 
papillate areas, rather permanently embedded in the tissues ; spore 
balls composed entirely of firmly united fertile cells , of medium 
size ; spores usually dark colored, variable, of medium size ; some¬ 
times preceded by conidia, forming a conspicuous white growth on 
surface of leaves, hyaline, oblong to ovate. 
Often the spore balls show remains of hyphae surrounding them 
but not as a definite cortex of sterile cells. This indicates relation¬ 
ship to Urocystis. The species are most commonly found in the 
cooler regions of the world. Tuburcinia Trientalis, apparently, is 
the only one that is known to possess the conidial stage. Three or 
four species are now placed under the genus, two of which occur 
here. 
Tuburcinia Clintoniae Ivom. 
Urocystis Colchici Ainer. Auct. p. p. 
Tuburcinia Trientalis Amer. Auct. p. p. 
Tuburcinia Clintoniae Kom., Jacz.-Ivom.-Tranz., Fungi Rossiae, 260. 
1899. 
Exsiccati : Tuburcinia Clintoniae Ivom., on Streptopus roseus, Barth., 
Fungi Col., 1789. 
Sori in leaves, oval to subcircular, about 2-5 mm. in length, 
forming flat minutely granular agglutinated black areas showing on 
both sides, permanently covered by the epidermis; spore balls dark 
reddish brown, ovoid to spherical, often surrounded by an incon¬ 
spicuous covering of sterile threads, firm, 6 to many spores, 27-75 
fx in length ; spores reddish brown, variable, somewhat oblong or 
cuneate to chiefly polygonal in cross section, smooth, 12-18 p in 
length ; conidial stage unknown. 
Hosts: Smilacina stellata, Mont.; Smilacina sp., Wise.; Strep¬ 
topus roseus , Brit. Col. 
Komarov has described this species on Clintonia from Russia as 
distinct from Tuburcinia Trientalis. His type exsiccati specimens 
agree with the forms reported from Korth America on Smilacina 
and Streptopus. In his description of the spore balls and spores, 
Komarov gives their measurements smaller than they really are. 
The germination of this species is not known. 
