ON LILIACE.E 



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 p.p. 



Puccinia mixta Fckl., forma simplicior Korn. 



Uromyces Alliorum DC. ; Cooke, Handb. p. 518 ; Micr. Fung. p. 212. 



Plowr. Ured. p. 137 p.p. 

 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 long. 



Fig. 73. U. ambiguus. Teleutospores 

 and uredospore on Allium Scorodo- 

 prasum. 



