UROMYCES 



87 



The uredospores seem to be variable in their markings ; some are 

 distinctly verrucose with pointed warts ; others are as distinctly echinulate. 



Distribution : Europe and South Africa. 



2. Uromyces Scrophulariae Fckl. 



JEtidium Scrophulariae DC. ; Cooke, Handb. p. 544 ; Micr. Fung. 



p. 199. 

 Uromyces Scrophulariae Fckl. Syrnb. Myc. p. 63. Plowr. Ured. p. 139. 



Sacc. Syll. vii. 559. Sydow, Monogr. ii. 27. Fischer, Ured. 



Schweiz, p. 75, f. 56. 

 V. concomitans B. et Br. ; Cooke, Micr. Fung. p. 213. 



Spermogones. Few, singly or in little groups, simul- 

 taneously with the secidia. 



JUcidiospores. zEcidia hypophyllous or on the stems, on 

 yellowish spots, in rounded clusters or in more or less elongated 

 patches on the nerves and stems, cup-shaped, yellowish ; margin 

 involute, entire ; spores verruculose, smooth below, yellowish, 

 18—21 x 14— 18 /*. 



Teleutospores. Sori small and roundish, arranged like 

 the secidia except that they form 

 more elongated groups (as much as 

 10 cm. long) on the stems, long- 

 covered by the lead-coloured epider- 

 mis, at length naked and pulverulent. 

 dark -brown ; spores very irregular, 

 obovate, fusiform, or ellipsoid, angu- 

 lar, rarely sub-globose, apex rounded, 

 truncate or slightly pointed, some- 

 what thickened (up to (5 /j,), with 

 tenuated below, smooth, brown, 18 — 35x11 — 18^; pedicels 

 persistent, hyaline or yellowish, nearly as long as the spore. 



On leaves, petioles and stems of Scroph ularia aquatica, 

 S. nodosa. July — -September. Not common. (Fig. 39.) 



The spots on the leaves are pallid, edged with violet-brown. The 

 teleutospores especially cause considerable distortion of the leaves and 

 stems. The two kinds of spores may be produced on the same mycelium, 

 and the secidia and teleuto-sori can occur simultaneously and intermixed, 

 or the latter surrounding the former (Grevillea, iii. 181, pi. 36). For this 



Fig. 39. U. Scrophulariae. 

 Teleutospores on S. aquatica. 



a 



dark-coloured cap, at- 



