. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON 121 running from apex to base, evenly coloured, brown, 18—32 x 14—'22/u,; epispore uniformly thin, about I^/jl thick; pedicels hyaline, often deciduous, as long as or longer than the spore. On leaves of Endyinion non-scriptum (Scilla nutans), and also of Scilla bifolia, S. campanulata. Common. April—June. (Fig. 72.) The yellow spots and the concentric arrangement of the sori are often very marked. The mycelium is purely local. A few finely echinulate uredospores, 27 x 20 p, were fo
. The British rust fungi (Uredinales) their biology and classification. Rust fungi -- Great Britain. ON 121 running from apex to base, evenly coloured, brown, 18—32 x 14—'22/u,; epispore uniformly thin, about I^/jl thick; pedicels hyaline, often deciduous, as long as or longer than the spore. On leaves of Endyinion non-scriptum (Scilla nutans), and also of Scilla bifolia, S. campanulata. Common. April—June. (Fig. 72.) The yellow spots and the concentric arrangement of the sori are often very marked. The mycelium is purely local. A few finely echinulate uredospores, 27 x 20 p, were found by Juel in the young sori on Scilla obtusifolia (Bull. Soc. Myc. Fr. xvii. 259). Distribution : Central and Southern Europe and Morocco. 33. Uromyces ambiguus Lev. Uredo ambigua DC. Flor. fr. vi. 64. U. Alliorum Cooke, Handb. p. 528 ; Micr. Fung. p. 217 Puccinia mixta Fckl., forma simplicior Korn. Uromyces Alliorum DC. ; Cooke, Handb. p. 518 ; Micr. Fung. p. 212. Plowr. Ured. p. 137 U. ambiguus Lev. Ann. Sci. Nat. 3, viii. 375. Sacc. Syll. vii. 543. Sydow, Monogr. ii. 262. Grove, Journ. Bot. 1911, p. 367. Uredospores. Sori amphigenous, without spots, scattered, roundish or oblong, long covered by the epidermis, yellowish; spores globose to obovate, delicately verruculose, pale-yellowish, 20—28x17— 22 fji\ epispore 3—3^/x thick, with six or seven germ-pores. Teleutospores. Sori am- phigenous and on the stems, on the leaves scattered, small and roundish, on the stems confluent and larger, up to 15 mm. long, always covered by the blue-grey epidermis; spores subglobose to pyriform, rounded above, without a papilla and scarcely thickened, rounded or narrowed below, smooth, brown, 20—35 x 17—24 /*; pedicels thin, hyaline, fragile, as much as 30 fi Fig. 73. U. ambiguus. Teleutospores and uredospore on Allium Scorodo- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability -
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