64 British l/redinecs and Ustilaginece. 



cylindrical, with whitish torn edges. Spores subglobose, very 

 finely verrucose, orange-yellow, 15-25 x 12-18/^, 



Uredospores — Sori orange, pulverulent, elongated or linear, often 

 confluent. Spores globose or ovate, with three or four germ- 

 pores, echinulate, orange-yellow, 20-28 x 15-20/x. 



Teleutospores — Sori persistent, black, linear, often confluent, long 

 covered by the epidermis. Spores subcylindrical or cuneiform, 

 attenuated below, constriction slight or absent, apex truncate, 

 somewhat thickened, with six or seven curved blunt processes, 

 brown, 40-60 x i2-2 0jn. Pedicels short, thick. 



Synonytns. 



Puccinia coronata. Corda, " Icones," vol. i. p. 6, t. ii. fig. 96. 

 Winter in Rabh., " Krypt. Flor.,"vol. i. p. 218. Schrot, " Krypt. 

 Flor. Schl.," p. 323. Cooke, " Hdbk.," p. 494; "Micro. Fungi," 

 4th edit., p. 203, t. iv. figs. 60-62. 



^cidium crassum, Pers. Berk., " Eng. Flor.," vol. v. p. 373. 

 Pers., "Ic. et Descrip.," t. 10, figs, i, 2. Cooke, "Hdbk.," 

 538 ; " Micro. Fungi," 4th edit, p. 196. 



yUcidium rhamni. Pers., " Obs.," t. 2, fig. 4. Purton, " Midi, 

 Flor.," vol. iii. No. 1538. 



Exsiccati. 



Berk., no. Cooke, i. 7, 26; ii. 94, 95 ; " L. F.," 53. Vize, 

 "Micro. Fungi," 116, 155 ; "Micro. Fungi Brit," 210, 234. 



^cidiospores on Rhamnus frangula and catharticus, May and 

 June. 



Teleutospores on Holcus mollis, Avena elafior, saliva, Festuca 

 sylvatica, Lolium pere7me, Dactylis glomerata, July to September, 

 and throughout the winter. 



Biology. — Nielsen found that when the aecidiospores from Rham- 

 fius frangtela and cathartica were placed on LoHttm pere/ute, the latter 

 only gave rise to uredospores, and that these uredospores, put on 

 Avena sativa, reproduced the uredospores and subsequently the teleu- 

 tospores of P. coronata. I have found, by numerous cultures, that the 

 teleutospores from Dactylis glomerata and Festuca sylvatica readily 

 produced the ascidium on R. frangula, but I have failed to produce 

 on R. frattgula the jecidium from the teleutospores on Lolium perenue. 

 I think two species are confounded under the name P. coronata. As 



