CLINTON: NORTH AMERICAN USTILAGINEAE. 
427 
Tolyposporium Wor. 
Abh. Senck. Nat. Ges., 12: 577. 1882. 
Type: Tolyposporium Junci { Schrot) Wor. 
Host: Juncus bufonius. Germ. 
Sori usually in the inflorescence, more especially in the ovaries, 
forming a granular spore mass at maturity ; spore balls dark colored, 
composed of numerous spores permanently united , of medium size ; 
spores bound together by ridged folds or thickenings of their outer 
walls , of small to medium size ; germination about as in Ustilago. 
This genus is characterized by the very firm spore balls whose 
individual spores are bound together by ridged folds or thickenings 
of their outer darker colored coats. Upon rupture, by pressure, of 
the spore balls these ridges often show as reticulations or as spine¬ 
like processes at the margins of the lighter colored spores. Sac- 
cardo describes thirteen species, some of which very likely belong 
under Sorosporium. The hosts are chiefly among the Gramineae. 
Only two species have been reported from North America. 
Tolyposporium bullatum (Schrot.) Schrot. 
Sorosporium bullatum Sclirot., Abli. Scliles. Ges., Abtli. Nat. Med., 
1869-72: 6. 1869. 
Tolyposporium bullatum Schrot., Krypt. FI. Schles., 3 1 : 276. 1887. 
Exsiccati: Sorosporium bullatum Schrot., on Panicum Crus-galli , Ell. 
N. A. Fungi, 295 ; Tolyposporium bullatum (Schrot.) Schrot., on Panicum 
Crus-galli, Seym. & Earle, Econ. Fungi Clinton Ust. Supp., C 53. 
Sori in ovaries, ovate, about 3-5 mm. in length, covered with a 
greenish smooth membrane, upon rupture of which the black granu¬ 
lar spore mass becomes scattered; spore balls black, opaque, oblong 
to spherical or polyhedral, usually containing 100 or more firmly 
agglutinated spores, chiefly 50-1(30 p in length; spores semihyaline 
to light reddish brown, covered with a thin tinted outer coat more 
or less folded in ridges by which the spores are bound together and 
which on rupture of spore balls often show as spiny projections at 
spore margin, usually ovoid to subspherical or polyhedral, 7-12 p, 
or rarely most elongated 14 p, in length. 
