i^o British Uredinece and Ustilao;inece. 



^3 



Uredospores — Sori linear, oblong or rounded, sometimes confluent, 

 amphigenous, golden-yellow. Spores globose, oval or sub- 

 ovate, orange, finely echinulate, with or without capitate 

 paraphyses, 20-25 x 30-35/*. 



Tdeiitospons — Sori small, sometimes round, but generally 

 elongate, oblong, or linear, covered by the cuticle, black, often 

 in clusters, sometimes confluent. Spores very irregular in 

 form and size, clavate, subfusiform, oblong, upper cell rounded, 

 truncate or attenuated, often obliquely, central constriction 

 little or none, lower cell generally cuneiform, clear brown, 

 epispore often appearing granular, 40-60 x io-12/x. Pedicels 

 very short. 



Synonym. 



^cidiuin ranunculaceanim, D. C. Cooke, " Micro. Fungi, 

 4th edit., p. 196, in part; " Hdbk.," p. 539. Johnst., "Flor. Berw., 

 vol. ii. p. 206, in part. 



Exsiccati. 



Vize, " Micro. Fungi Brit," 443, 548. 



^cidiospores on Ranunculus acris. 



Uredospores and teleutospores, on Alopccurus pratensis. 



>> 



Biology. — The life-history of this fungus was worked out in a 

 series of more than thirty cultures. The uredo, when produced 

 directly from the Eecidiospores, is without paraphyses ; but these appear 

 later on in the year. For details, see Quar. Jour. Micro. Science., 

 vol. XXV., new series, pp. 164-166. I have found this species near 

 King's Lynn ; and Mr. George Brebner has met with it at Aboyne, 

 Scotland. 



Puccinia persistens. Plow. 



y£cidiospores — On thickened spots, which are purple-brown above, 

 yellow below, and surrounded by brownish margins. Pseudo- 

 peridia cylindrical, short, yellow, with torn white edges. 

 Spores subglobose or oval, finely echinulate, orange-yellow, 

 20-30 X 17-20/X. 



Uredospores — Sori small, orange, round or elongate, on yellowish 

 spots. Spores subglobose, hyaline, finely echinulate, with 

 orange-yellow contents, 25-30/x in diameter. 



