I 10 



UROMYCES 



clusters, cup-shaped, whitish-yellow, with ;i torn revolute 

 margin; spores densely and minutely verruculusr, yellowish 

 I 5 -21 /j. diani. 



Fig. 62. U. Behenis. a, secidia on early leaf. 1>. secidia on later leaf, of 

 S. in fid tn ; two teleutospores. 



Teleutospores. Sori hypophyllous and on the stems, often 

 surrounding the secondary secidia, irregularly scattered, gre- 

 garious or circinate, rounded or oblong, covered for a considerable 

 time by the lead-coloured epidermis, rather small and compact, 

 brownish-black or black; spores subglobose or obovate, rounded 

 above and thickened (as much as 11 /x), smooth, pale brown, 

 25 — 35 x 20 — 27 jx ; pedicels persistent, faintly yellow, thick, 

 as much as 75 /x long. 



On Silene inflata (latifolia), S. maritima. Not common. 



. hViuia and teleutospores, July — October. (Fig. 62.) 



The .spots occupied by the secidia vary in colour, but the primary ones 

 are often tinged or margined with purple. This is one of the species 

 whose aecidiospores are capable of reproducing the secidia, as Dietel has 

 shown (Flora, lxxxi. 395, 1895). The primary secidia, on the earlier 

 leaves, are in roundish groups or concentric circles, only a few being 

 scattered. The secondary secidia, on the younger leaves, stand more often 

 singly and are spread over a larger area ; the teleuto-sori spring from 

 the same secondary mycelium or are formed separately. The secondary 

 secidia are not confined to the beginning of the season, but continue to be 

 produced till the end of autumn, being in fact the representatives of 

 the uredo-sori. 



On this account this species is very interesting biologically. The 

 primary secidia arise from infection by comparatively few basidiospores ; 

 the secondary arise from the more widely dispersed secidiospores of the 



