434 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
bori in ovaries, oblong, about 5 or 6 mm. in length, showing be¬ 
tween the glumes, upon rupture disclosing dark reddish brown dusty 
spore mass; spores foetid, showing different stages of development, 
with youngest as hyaline cells smaller than the mature spores which 
are chestnut brown, chiefly subspherical or spherical, provided with 
evident often regular polygonal reticulations (in some varying to 
irregularly elongated or somewhat cerebriform) which show at cir¬ 
cumference as more or less evident winged projections 1-3 /x in 
height, 23-28 /x in diameter. 
Hosts: Elymusglaucus, Mont.; Elymus sp., Wash. (type). 
Type specimens of this species obtained from Ilolwav have many 
of the spores with irregular or even cerebriform reticulations show¬ 
ing the species to be very closely related to Tilletia cerebrinci. The 
specimens that have been issued in exsiccati, however, have spores 
with much more regular reticulations. Massee considers the species 
near Tilletia controversa. Its germination has not been reported. 
Tilletia cerebrina Ell. & Ev. 
Tilletia cerebrina Ell. & Ev., Journ. Myc., 3 : 56. 1887. 
Sori in ovaries, ovoid, 1—2 mm. in length, showing somewhat 
through the glumes ; sterile cells hyaline, smaller than the spores, 
with medium thick walls; spores rather dark reddish brown, chiefly 
ovoid to spherical, with prominent polygonal or irregularly elon¬ 
gated or even cerebriform reticulations often ending: in free ridsres 
and at circumference showing as projections (1-2.5 fx extending out 
to enveloping membrane), chiefly 24-30 /x in length. 
Host: Deschampsia caespitosa , Rocky Mts. (type). 
Tilletia Airae Blytt, may be only a variation of this species. 
Bor the present, however, the specimens on Deschampsia calycina 
have been placed under that species. This species has not been 
germinated. 
Tilletia Airae Blytt. 
Tilletia Airae Blytt, Christ. Vid. Selsk. Forh., n. 6, 1896 : 31. 1896. 
Sori and spores same as in Tilletia cerebrina, except reticulations 
of spores regular instead of cerebriform. 
Host: Deschampsia calycina , Ore., Wash. 
