68 



Feridcrmium Cerebrum, Peck. 



Peridia large, convex, erumpent, irregularly confluent, forming brain-like 

 convolutions, white, rupturing irregularly, the cells radiate-striate on the 

 margin; spores ovate-elliptical or subglobose, rough, yellow, .0008'-.0011' 

 long. 



Trunks and branches of young pine trees, Pinus rigida, forming 

 excrescences half an inch to two inches in diameter. Center, J. 

 A. Lintner. 



Roestelia aurantiaca, Peck, 



Peridia cylindrical, fragile, soon lacerated, fugacious, white ; spores sub- 

 globose, bright orange, about .001' in diameter, with a thick hyaline epispore. 



Unripe fruit of AmelancMer Canadensis. New Baltimore, J. 

 L. ZabrisTcie. Keene. July. Also on the unripe fruit of Crataegus. 

 Buffalo, Clinton. 



The color of the spores will enable this species to be easily recog- 

 nized. 



Aecidium Gerardiae, Peck. 



Spots small, suborbicular, scattered, yellowish-green, peridia usually few, 

 small, short, the mouth fringed with spreading or recurved teeth ; spores 

 orange, .0008' in diameter. 



Leaves of Gerardia quercifolia. Highlands near Cold Spring. 

 June. 



Aecidium album, Clinton. 



Spots none ; peridia scattered, short, white, the margin subentire ; spores 

 subglobose, white, about .0008' in diameter. 

 Under surface of leaves of Vicia Americana. Buffalo, Clinton. 



Aecidium Lycopi, Gerard. 



Spots yellow ; subiculum more or less thickened ; peridia short, scattered 

 or crowded, margin crenate ; spores pale yellow. 



Leaves, stems and petioles of Lycopus Eurqpaeus. Pough- 

 keepsie, Gerard. Buffalo, Clinton. June. 



Aecidium Hydrophylli, Peck. 



Spots small, few, yellow, with a pale greenish border; subiculum thickened 

 whitish ; peridia few, generally crowded, short, the margin subcrenate ; 

 spores bright yellow or orange ; spermogonia central, on the opposite side. 



Under surface of leaves of Hydrophyllum Canadense. CatskiU 

 Mountains. June. 



