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Peridermium 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 Amelanchier Canadensis. New Baltimore, J. 
L. Zabriskie. 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 Huropaeus. 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 Hydrophyllim Canadense, Catskill 
Mountains. June. 
