DECADES OP MAINE ETTNGX. 181 



iEcidium Hypericatum, Schwz. Spots small, roundish, orange ; Peridia 

 cylindrical, elevated, collected in small tufts, whitish when dried. Spores 

 oblong, whitish, pellucid. 



On leaves of Hypericum perforatum (Westbrook) also on Hypericum frondosum 

 (fide Schweinitz). 



(Schweinitz Syn. Car. No. 451.— Fung. Am. Bor. No. 2883.) 



Whether the spores of the species on leaves of H. perforatum, received from 

 the Eev. E. C. Bolles, are whitish, or yellow when fresh, could not be 

 determined from the dried specimens. It is referred here to Schweinitz's 

 species, with which it accords in other respects. Although the Hypericum is 

 common in England, neither the sEcidium nor Uromyces has yet been found on it. 



iEcidium asteratum, Schwz. Spots pallid purple, sometimes confluent. 

 Peridia clustered and semi-immersed. Spores white. 



On leaves and stems of Aster, (Westbrook). On Aster cordifolius (New York, 

 W. W. Denslow). 

 (Schweinitz Syn. Car. No. 444. — Syn. Fung. Am. Bor. No. 2870.) 



The only appreciable difference between this and IEcidium compositarum, 

 D. C. appears to be in the colour of the spores, and it is doubtful whether this 

 is as reliable a distinction as hitherto supposed. 



PUCCTNLEI. 

 a. Spores stipitate : 

 Spores multiseptate — Aregma. 

 " biseptate — Triphragmium. 

 " uniseptate — Puccinia. 



b. Spores immersed in Gelatine : 

 Stroma tremelloid and expanded — Gymnosporangium. 

 " clavate, or club-shaped — Podisoma. 



Aregma Fr. 

 Spores cylindrical, multiseptate, borne on a long peduncle. 

 Three American species are well known. Two of these are European. One 

 only has yet been sent from Maine. 



Aregma mucronatum, Pr. 



Uredo'-form. (Lecythea Rosoz, Lev.^) 



Spots yellow, small, scattered ; spores sub-oval, sometimes minute- 

 ly pedicellate, orange. 



Septate-form — Hypogenous, scattered over the leaves in minute 

 tufts; spores 5 to 7-septate, terminal joint mucronate ; peduncles 

 incrassated below, fusiform. 



On leaves of Eoses (Westbrook, E. C. B.) 



Curtis in Silliman's Journ. 1848, vi. p. 353, No. 26. 



Proc. P. S. N. H. vol. 1. 15 



