270 Bj'itish Uredinece and Ustilaginece. 



Biology. — Although Winter and Schroter consider this species 

 to be the ^cidium of Fuccima fusca, yet, in the absence of direct 

 biological evidence, I venture to differ from them. The Puccinia in 

 question is very common, but the ^cidium is rare in Britain. 



iEcidium bunii. D. C. 



^cidiospores — Pseudoperidia generally on swellings on the stems, 

 shortly cylindrical, with whitish, torn, everted edges. Spores 

 polygonal, finely verrucose, orange^yellow, 15— 20/x in diameter, 

 sometimes 25/x long. 



Synonyjn. 

 yScidium bunii, Vt.C. "Syn.," p. 51. Berk., " Eng. Flor.,"" 



vol. V. p. 370. Cooke, " Hdbk.," p. 540; "Micro. Fungi," 4th 



edit., p. 196. Grev., "Flor. Edin.," p. 445. 



On Conopodium denudahim [Biniium flexuosum). 



Biology. — This ^cidium is comparatively rare in Britain, and 

 I have never been able to obtain any evidence that it is connected 

 with the Puccinia which occurs on the same host-plant. 



.fficidium euphorbiae. Gmelin. 



Pseudoperidia equally scattered over the whole leaf-surface, at 

 first conical, then cup-shaped, with whitish torn edges. 

 Spores polygonal or subglobose, finely verrucose, orange- 

 yellow, 19-26 X 30-35/^- 



Sytwnym. 

 Winter, loc. cit., p. 261. 



yEcidimn euphorhicz. Gmelin, " Linne Syst. Nat.," vol. ii. 

 p. 1473, in part. Purton, "Midi. Flor.," vol. iii. No. 1537 (?). 



On Euphorbia exigua. 

 Hampshire ; Mr. Hill. 



.fficidium elatinum. Alb. and Schvv, 



Mycelium perennial in the affected branches, causing fusiform 

 swellings, from which are given off deformed shoots {Hexen- 

 besen), which bear pale green, short, swollen leaves on all 



