208 



PUCCINIA 



/'. Pruni DC. Flor. IV. ii. 222 (1805). Plowr. Ured. p. 192. Sacc. 



Syll. vii. 648. 

 /'. Prunorum Link, Sp. PL ii. 82 (1825). Cooke, Handb. p. 507; 



Micr. Fun-. ]». 211 : Grevillea, iii. pi. 49, f. 11. 

 Tranzschelia punctata Arthur, North Americ. Fl. vii. 151. 



Spermogones. Amphigenous, scattered, brown or blackish, 

 very shallow, punctiform. 



/Ecidiospores. /Ecidia hypophyllous, scattered over the 



whole surface, flat, with a 

 broad revolute margin which 

 is torn into few (3 — 5) lobes; 

 spores roundish, pale yellow- 

 ish-brown, finely verruculose, 

 16—24 fi. 



Uredospores. Sori hypo- 

 phyllous, generally on minute 

 coloured spots, scattered, but 

 often crowded and confluent, 

 soon naked, pulverulent, cin- 

 namon-brown ; spores ellip- 

 soid to fusiform, ovoid-oblong or sub-pyriform, smooth and 

 more or less thickened at the summit in a conical shape and 

 darker, paler and narrowed below, where they are sharply 



Fig. 155. P. Pruni-spinosae. iEcidia 

 on A. coronaria (slightly reduced) ; a, 

 an secidium on A. Aemorosa, York- 

 shire, the normal form, and b, two less 

 usual forms, x 30. 



Fig. 156. P. Pruni-spinosae. Two teleutospores ; a, lower half of a teleuto- 

 spore ; b, uredospore ; c, paraphysis ; d, a cluster of teleutospores. On 

 Wild Plum. (All x 600, except d, which is x 360.) 



verrucose or echinulate, pale-brown, 20 — 35 x 10 — 18 /x (with 

 three or four equatorial germ-pores, Arthur), mixed with 

 yellowish-brown or pale capitate paraphyses more or less 

 thickened at the apex. 



