370 
CHARLES C. REES 
petiolicolous and caulicolous, gregarious in round or elongated groups 
of various sizes, up to lo mm. in length, cupulate, low, 0.3-1 mm. in 
diameter; peridium white, turning to yellowish-brown, opening by a 
central pore, enlarging later, the margin erect or incurved slightly, 
erose; peridial cells oblong in cross section, 26-29 by 32-39 ju, abutted, 
the outer wall 7-13 m thick, striate, the inner wall 9-12 /z in thickness, 
very finely and almost inconspicuously verrucose; aeciospores angu- 
larly globoid, 19-23 by 19-27 /jl] wall pale yellow, 1.5-2.5 fj, in thick- 
ness, finely and closely verrucose. 
III. Telia amphigenous, numerous, scattered, elongated, 0.2-1.3 
mm. in length, tardily naked, finally dehiscent by longitudinal slits 
in the epidermis, pulverulent, chestnut-brown, ruptured epidermis 
conspicuous; teliospores broadly ellipsoid to globoid (exclusive of 
apiculus), 23-27 by 31-35 m (including apiculus) ; wall chestnut" 
brown, about 3 [jl thick, a low hyaline apiculus at the apex, moder- 
ately rugose with longitudinal parallel ridges, sometimes appearing 
almost smooth when wet; pedicel very fragile, short, hyaline. 
On Liliaceae: Lilium bulbiferum L., L. candidum L., L. carni- 
olicum Bernh. and L. croceum Chaix. Throughout central Europe. 
Type locality: Europe, on Lilium candidum. 
ExsicCATi: Thiim. Myc. Univ. 1041; Thum. Fungi Austr. 848; 
Rab. Fungi Eur. idgs; Sydow, Ured. 1504; Sydow, Myc. March. 
3010; Kunze, Fungi Sel. 35. 
Even in those collections showing teliospores only, Uromyces 
aecidiiformis is readily distinguished from Uromyces Holwayi, since 
the teliospores of the former are more nearly globoid and have slightly 
thicker walls than the latter (Fig. i). However, the presence of 
Fig. I. Teliospores of Uromyces aecidiiformis showing optical sections and 
surface view. X 625. 
aeciospores, which are quite different in the two species, enables one to 
separate them readily. 
