. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON UMBELLIFER^: 191 between the two forms. Conium macxdatxim took the infection very weakly. Lindroth and Fischer both describe the teleutopores as furnished with nunaerous minvite 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
. The British rust fungi (Uredinales), their biology and classification. Uredineae. ON UMBELLIFER^: 191 between the two forms. Conium macxdatxim took the infection very weakly. Lindroth and Fischer both describe the teleutopores as furnished with nunaerous minvite 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 Plowr. Ured. p. 183 Sydow, Monogr. i. 403 Fischer, Qred. Schweiz, p. 119, f. 91 b. P. Silai Fckl. KSymb. Myc. p. 53. Cooke, Grevillea, xiv. 39. ^permogones. 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—5yu), echin- ulate, • brown, 25—40 x 18— 28IX, with three (rarely four) germ-pores. Teleutospores. Sori minute, similar, but soinetimes 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—32 jx; pedicels hyaline, rather short, deciduous. On Silaus pratensis. Rare; Pontrilas; Kew Gardens. August, September. (Fig. 139.). Fig. 139. P. ,Silai. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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