1 88 British Uredincd and Ustilaginccr. 



III. HEMIPUCCINIA. Schrot. 



Having uredospores and teleutospores, the latter germinating only after 

 a period of rest. 



Puccinia polygoni. Pers. 



Uirdospores — Sori at first yellowish brown, then dark brown, 

 roundish, scattered irregularly or arranged in circular groups, 

 soon pulverulent. Spores spherical, elliptical, or ovate, echi- 

 nulate, brown, 17-30 x 16-20/x. 



Teleutospores — Sori compact, blackish, generally crowded, rounded 

 or elliptical, on the stems, elongated, often confluent, brown. 

 Spores cuneiform or clavate, constriction slight or absent, base 

 attenuated towards the stem, apex much thickened (4-7/x), 

 rounded, truncate, capitate or conical, smooth, brown, 30-50 

 X 14-20/X. Pedicels about as long as the spores, persistent. 



Synonyms. 



Puccinia polygoni. Pers. , " Syn . , " p. 227. 



Puccinia polygonorum, Link. Cooke, " Micro. Fungi," 4th 

 edit., p. 203; "Hdbk.," p. 495. Berk., " Eng. Flor.," vol v. 

 P- Z^Z- Johnst., "Flor. Berw.," vol. ii. p. 195; Grev., "Flor. 

 Edin.," p. 430. 



Puccinia amphibii, Fckl. Cooke, " Micro. Fungi," 4th edit., 

 p. 204. 



U redo poly gonorum, D. C. Grev,, t. 80. Berk., " Eng. Flor.," 

 vol. V. p. 377. Johnst., " Flor. Berw.," vol. ii. p. 201. 



Trickobasis poIygonorunij'Eerk. Cooke, " Micro. Fungi," 4th 

 edit., p. 226. 



Exsiccati. 



Berk., 231, 216. Cooke, i. 27; " L. F.," 5, 42. Vize, 

 " Micro. Fungi Brit.," 28; "Fungi Brit.," in. 



On Polygonum convolvulus, amphibium, lapatJiifolittm. 

 June to November. 



Biology.— Winter (Rabh., " Krypt. Flor.," vol. i. pp. 185, 186) 

 separates the form on P. ampliibium, following Fuckel, the principal 

 morphological difference being that in this form the teleutospores 

 remain covered by the epidermis. This is also the case when the 

 fungus occurs on P. lapathifoHuni. On P. convolvulus the sori are 



