FLemipuccinia. 193 
thickened, bluntly conical, closely echinulate, brown, 20-35 x 
12-16, mixed with numerous capitate brownish paraphyses. 
Teleutospores—Sori pulverulent, dark brown, almost black. Spores 
consisting of two spherical cells, flattened at their point of 
union, the lower cell often being smaller and paler. Epispore 
uniformly thick, chestnut-brown, thickly studded with short stout 
spines. Spores 30-45 X 17-25. Pedicels short, colourless. 
Synonyms. 
Puccinia pruni-spinose, Pers, Winter in Rabh., “Krypt. Flor.,” 
vol. i. p. 193. 
Puccinia pruni. Pers., ‘‘Syn.,” p. 226. 
Puccinia prunorum, Link. Berk., “ Eng. Flor.,” vol. v. p. 368. 
Cooke, “Hdbk.,” p. 507; ‘‘ Micro. Fungi,” 4th edit, p. 211. 
Purton, ‘‘ Midl. Flor.,” vol. iii. No. 1552. 
Trichobasis rhamni. Cooke, “ Hdbk.,” p. 507. 
Lixsiccatt. 
Baxt., 83. Cooke, 1. 51; ii. 139. Vize, ‘‘ Micro. Fungi,” 128. 
On Prunus spinosa, domestica, Rhamnus catharticus. 
BIoLoGy.—The teleutospores are very apt to fall asunder at the 
septum. The frequently imperfect development of the lower cell shows 
the relationship which exists between the present genus and Uromyces. 
The form on Rhamnus requires to be experimentally examined. 
Puccinia argentata. (Schultz.) 
Uredospores—Sori yellowish brown, small, rounded, circinate or 
scattered, often confluent. Spores spherical or elliptical, finely 
echinulate, yellow, 15-20 X 14-18, 
Teleutospores—Sori rounded, chestnut-brown, soon pulverulent. 
Spores ovate or clavate, rounded or attenuated above, con- 
striction slight or absent, 25-35 X 12-174. Pedicels hyaline, 
very deciduous. 
Synonyms. 
Puccinia argentata (Schultz). Winter in Rabh., ‘‘ Krypt. Flor.,” 
vol. i. p. 194. 
Ecidium argentatum, Schultz. “Prod, Flor. Starg.,” p. 454. 
oO 
