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CHARLES C. REES 
location, the writer is inclined to consider it an Opsis-form similar in 
life history to Uromyces aecidiiformis and Uromyces Fritillariae. Suc- 
cessful cultures or additional material bearing other spore stages will 
be necessary before the full life history is understood. 
Morphologically this form is notably different from any species 
yet reported on any Liliaceous host either in North America or Europe 
and the addition of the North American material extends consider- 
ably the distribution of this distinctive species. The teliospores are 
more narrowly ellipsoid, have considerably thinner walls and are 
verrucose in longitudinal striations (Fig. 2). The teliospores of 
the other species discussed in this paper are distinctly rugose. 
4. Uromyces Fritillariae (Schlechtd.) Thiim.; Voss, Oesterr. Bot. 
Zeits. 26: 297. 1876 
Caeoma Fritillariae Schlecht. Linnaea i: 240. 1826. 
0. Pycnia amphigenous, rather numerous, scattered among the 
aecia, small, punctiform, conspicuous, subepidermal, honey-yellow 
becoming dark chestnut-brown, flattened globoid in cross section, 
80-95 M in width by 60-80 ij, high ; ostiolar filaments free. 
1. Aecia amphigenous, caulicolous, petiolicolous, crowded in linear 
groups, cupulate, low, 0.3-1 mm. in diameter; peridium at first white, 
becoming yellowish-brown later, opening by a central pore after a 
longitudinal splitting of the epidermis has taken place, the margin 
Fig. 3. Teliospores of Uromyces Fritillariae showing optical sections and surface 
view. X 625. 
incurved, erose; peridial cells oblong in cross section, 19-26 by 29-32 fi, 
abutted, the outer wall 9-13 /jl thick, striate, the inner wall 9-12 fx 
thick, very finely verrucose; aeciospores angularly globoid to ellipsoid, 
16-22 by 21-28 fx; wall yellow, 2-3 fx in thickness, very finely, closely 
and almost inconspicuously verrucose. 
