ON COMPOSITE 



155 



29. Puccinia Sonchi Rob. 



jEcidium Sonchi Johnst. ; Plowr. Ured. p. 266. 



Puccinia Sonchi Rob. in Desm. Ann. Sci. Nat. ser. 3, xi. 274. Grove, 



Sci. Gossip, 1885, p. 9, f. 6—9. Plowr. Ured. p. 196. Sacc. Syll. 



vii. 638. Sydow, Monogr. i. 154. 



[Spermogones. Obtained artificially on S. arvensis by Tranz- 

 schel.] 



Uredospores. Sori generally hypophyllous, on the stem 

 collected in small oblong patches 4 — 5 mm. long, on yellowish 

 spots, scattered or gregarious, minute, at first covered by the 

 epidermis which is raised over them in a hemispherical vesicle, 

 then pierced at the top but never widely open, yellowish, 

 surrounded by a dark-brown line of paraphyses ; spores more or 

 less oblong or obovate, densely verrucose, with a very thick 

 epispore, contents oily, yellowish, 24 — 38 x 15 — 21 fx. 



Fig. 107. P. Sonchi. a, the line of dark-brown paraphyses surrounding the 

 uredo-sori ; b, a pale-brown paraphysis ; c, a uredospore ; all on S. 

 oleraceus. x 600. 



[Teleutuspores. Sori hypophyllous, rarely on the stems, on 

 irregular brownish spots, more compact, rounded-pulvinate, 

 scattered or aggregated, confluent when on the stem, covered 

 by the epidermis, black ; spores ovate or oblong, rounded or 

 truncate (rarely attenuated) above, thickened (3 — 8 jjl), con- 

 stricted, rounded below, smooth, pale-brown, 30 — 60 x 20 — 30 /j, ; 

 pedicels somewhat long, brownish, persistent; mesospores ovate, 



