310 CRONARTIACEE 
CRONARTIACE. 
Nearly all hetercecious. 
Teleutospores one-celled, without pedicels, produced in 
chains; the chains remaining united laterally into bundles 
which may be either columnar, wart-like or discoid; germinating 
when mature by typical basidia. All the sori subepidermal ; 
spermogones 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. AXcidia 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. Acidia erumpent, 
inflated, with a membranous peridium which ruptures at the sides; 
wcidiospores partly smooth, not uniformly verrucose over the whole 
surface, owing to partial fusion of the warts. Cronartium. 
CHRYSOMYXA Unger. 
Spermogones hemispherical. icidia with a well-developed 
peridium; scidiospores with coarsely verrucose membrane, 
without germ-pores. Uredospores produced in rows by basi- 
petal abstriction, resembling ecidiospores, 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 xcidium, 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 
