310 CRONARTlAt t..i: 



cronaktiacej:. 



Nearly all heterceciou-. 



Teleutospores one-celled, without pedicels, produced in 

 chains; the chains remaining united laterally into bundles 

 which may be either columnar, wart -like or discoid; germinal ing 

 when mature by typical basidia. All the sori subepidermal; 

 -|nTinogones are known in both genera. 



Teleutospores in long chains, united into pulvinate sori; cell-wall 

 smooth, colourless. Uredospores catenulate, surrounded by a very 

 delicate evanescent peridium. -Ecidia not known in the British species. 



Chrysomyxa. 



Teleutospores in long chains, united into columnar sori ; wall smooth, 

 slightly coloured. Uredospores borne singly on pedicels, echinulate, sur- 

 rounded by a peridium which ruptures at the summit. -Ecidia erumpent, 

 inflated, with a membranous peridium which ruptures at the sides : 

 secidiospores partly smooth, not uniformly verrucose over the whole 

 surface, owing to partial fusion of the warts. Cronartium. 



CHRYSOMYXA Unger. 



Spermogones hemispherical. .Kcidia with a well-developed 

 peridium : a^cidiospores with coarsely verrucose membrane, 

 without germ-pores. Uredospores produced in rows by basi- 

 petal abstriction, resembling aecidiospores, but without or with 

 a very delicate peridium. Teleutospores forming velvety 

 pulvinate sori, in simple or branched chains, one-celled, with 

 thin colourless membrane, germinating without a resting 

 period. 



In addition to the two species mentioned below, it is stated 

 in Massee (Plant Diseases, p. 266) that the secidium, named 

 Peridermium coruscans (Fr.) and assigned by Tranzschel to a 

 Chrysomyxa on Ledum, has been seen on Picea Pinsapo in 

 England, doubtless on newly imported plants. It is common on 



