CLINTON: NORTH AMERICAN USTIL A GIN E A E. 
435 
The above specimens received from Griffiths and Piper differ 
from the type specimens of Tilletia cerebrina in having the winged 
reticulations of the spores regular instead of often being cerebriform. 
In this respect they agree with Tilletia Airae Blytt, which was 
described as distinct from T. cerebrina chiefly on this difference. 
The writer has not seen European specimens of T. Airae and is not 
sure that it is entitled to specific difference, but for the present has 
placed it here with that rank. The different specimens of Tilletia 
Elymi vary somewhat as to the reticulation of the spores and so this 
may possibly be only an extreme variation of Tilletia cerebrina. 
Literature : 16. 
/ 
Tilletia montana Ell. & Ev. 
Tilletia montana Ell. & Ev., Journ. Myc., 3: 55. 1887. 
Exsiccati: Tilletia asperifolia Ell. & Ev., 1 on Sporobolus simplex, Griff., 
West Amer. Fungi, 226. 
Sori in ovaries, ovoid, about 1 mm. long, showing somewhat 
between and also slightly through the enveloping glumes ; sterile 
cells hyaline, usually smaller than the spores, not very numerous, 
with thick wall ; spores reddish brown, ovoid to spherical, with 
evident hyaline enveloping membrane about 2-3 /x from spore 
having a papilla or thread of detachment at one side, with reticula¬ 
tions of wall somewhat irregular forming polygonal or sometimes 
more elongated areas and occasionally with free ridges projecting 
into these, with the reticulations showing at circumference as 
straight projecting spines, 17-25 fx in length. 
Hosts : Redfieldia flexuosa , 2 Neb.; Sporobolus gracillimus , 
Rocky Mts. (type) ; S. simplex / Mont. 
The writer has seen the type collection of this species and this 
appears quite distinct from Tilletia, asperifolia which also occurs on 
Sporobolus and which Massee considers the same as this species. 
The differences noted may be due possibly to the young condition 
of the specimen that was examined though this seems hardly prob¬ 
able. Tilletia zonata of Brefeld has not been seen and while it 
1 This specimen seems to agree better with the species described here than 
with T. asperifolia. The reticulations of the spores are rather obscure. 
' l The writer has not seen specimens on this host. 
