ON UMBELLIFERjE 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. Conii, except in being relatively broader ; these two species are 

 closely allied. 



Distribution : Central and Northern Europe. 



63. Puccinia Silai Fckl. 



Puccinia 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 b. 

 P. Silai Fckl. Syrnb. Myc. p. 53. 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- 

 bose to ovate, more or less 

 thickened above (4— 5/*), echin- Fig 139 P _ silai. Teleutospores. 

 ulate, brown, 25 — 40 x 18 — 

 28 /x, 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 — 42x18 — 32 /j,; pedicels hyaline, rather 

 short, deciduous. 



On Silaus pratensis. Rare ; Pontrilas ; Kew Gardens. 

 August, September. (Fig. 139.) 



