172 British Uredinecr and UstilaginecE. 



^cidiospores on Sentxio jacobcea^ May and June. 

 Uredospores and teleutospores on Carex arenaria, July to May. 



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

 series of numerous cultures, by which it proved to be distinct not only 

 from P. caricis, but also from P. arenariicola; for the details of which 

 see Quart. Jour. Micro. Science., vol. xxv., new series, pp. 167 and 

 170 ; and also Linn. your. Soc. Bof., vol. xxiv. pp. go-95. It has been 

 found by me at North Wootton, Norfolk ; at Skegness, Lincolnshire ; 

 and by Professor J. W. H. Trail near Aberdeen. 



Puccinia sylvatica. Schrot. 



y^cidiospores — -Pseudoperidia on round or elongate patches, which 

 are often surrounded by a violet margin, crowded, short, with 

 white torn edges. Spores polygonal, smooth, orange-yellow, 

 14-2 iju, in diameter. 



Uredospores — Sori small, scattered, dark brown. Spores globose, 

 elliptical, or ovate, brown, echinulate, 22-26 X i5-2 2/>(,. 



Teleutospores— ^oxi small, round, persistent, pulvinate. Spores 

 clavate, apex much thickened, 6-8ya, rounded, base attenuated, 

 somewhat constricted, 35-44 X 12-20/x. Pedicels persistent, 

 about the length of the spores. 



Synonyjns. 



Puccinia sylvatica. Schrot., " Cohn's Beitrage," vol. iii. p. 68. 

 Winter in Rabh., " Krypt. Flor.," vol. i. p. 223. 



^cidium compositarum, Mart., var. Taraxaci. Grev., " Flor. 

 Edin.," p. 444. Cooke, " Hdbk.," p. 542; "Micro. Fungi," 

 4th edit., p. 198, in part. 



Ex sicca ti. 



Vize, " Micro. Fungi," 166. 



^cidiospores on Taraxacum officinale, June and July. 



Uredospores and teleutospores on Carex divulsa, brizoides, 

 prcecox, leporina, remota, rigida, pallescens, panicea, ericetoru?n, 

 pilulifera, flava. 



Biology. — The admission of this species into the British flora 

 requires confirmation, as the teleutospores have not yet been found in 

 this country. Mr. Grove also thinks that there are two aecidia on 



