174 ^CIDIACK^. 



Genus I. RCESTBI/IA. Reb. 



Peridium elongated, at length opening by lateral fissure or 

 terminal mouth. Spermogones on the opposite surface of the 

 same on different leaves. 



R. lacerata. 



On the under surface of the green leaves of the common hawthorn. 

 Craetegus. 



R. aurantiaca. Pk. 



Peridium, elongated, at length opening by a crown. 

 Spores, orange yellow. 



Genus II. PBRIDBRMIUM. Chew. 



Peridermium elongated, at length bursting irregularly. 

 Spermogonia scattered, conspicuous. 



P. pini. 



Peridium, oblong, scattered, large, spores orange color. 

 On pine needles. Trexlertown cemetery. 



Genus III. J^CIDIUM. Pers. Cluster Cups. 



Peridium not elongated, cup-shaped, opening by a terminal 

 mouth, bordered by a fringe of re volute teeth. Spores disposed 

 in chains, spermogonia on the same or opposite side. 



^. Berberidis. Pers. 

 Barberry Bush Cluster Cup. 



Spermogone none. Spots roundish, bright red, peridia in 



round, oval patches. Spores orange. 



Said to be a part of the Puccinia graminis cycle. On the common 

 barberry bush. 



