ON UMBELLIFERA 191 
between the two forms. Conium maculatum took the infection very 
weakly. 
Lindroth and Fischer both describe the teleutopores as furnished with 
numerous minute embedded granules, otherwise even or with low rounded 
undulations, but Fischer figures them as perfectly smooth, as they 
certainly are in the cases I have seen. The uredospores are spiny in the 
upper part, nearly smooth below. When the few spines on the basal part 
are not to be discerned (as sometimes happens), they closely resemble 
those of P. Conzi, except in being relatively broader ; these two species are 
closely allied. 
DISTRIBUTION : Central and Northern Europe. 
63. Puccinia Silai Fckl. 
Puceinia bullata Wint. Pilze, p. 191 p.p. Plowr. Ured. p. 183 p.p. 
Sydow, Monogr. i. 403 p.p. Fischer, Ured. Schweiz, p. 119, f. 91 8. 
P. Silat Fckl. Symb. Myc. p. 58. Cooke, Grevillea, xiv. 39. 
Spermogones. Scattered, pale yellowish, accompanying the 
primary uredo-sori. 
Uredospores. Primary sori generally on the nerves and 
petioles, elongated and con- 
fluent up to 3 cm. long, dark 
cinnamon; secondary hypo- (\ 
phyllous or occasionally epi- 
phyllous, scattered, minute, 
punctiform, brown; spores glo- ce ) 
bose to ovate, more or less 
thickened above(4—5 ),echin- Fig. 189. P. Silai. Teleutospores. 
ulate, brown, 25—40 x 18— 
28 «, with three (rarely four) germ-pores. 
Teleutospores. Sori minute, similar, but sometimes con- 
fluent on the stems, blackish; spores obovate or oblong, 
rounded at both ends or gently attenuated below, not thick- 
ened above, but often with a papilla, slightly constricted, 
smooth, brown, 28—42 x 18—82,,; pedicels hyaline, rather 
short, deciduous. 
On Silaus pratensis. Rare; Pontrilas; Kew Gardens. 
August, September. (Fig. 139.) 
