THE AMERICAN MUSEUM JOURNAL 



with an oblong kernel inside held in position by radiating fibers. Green and 

 soft in spring; brown and brittle later in the season. Varies from ^ to I in. in 

 •diameter. On leaves of red oak {Qucrcits rubra). Rather common. 



28. Oak Petiole Gall {Andricns pctioiicola Bass.). — Rounded or club-shaped, 

 hard and woody, with many cells inside. About f in. in diameter. Green in 

 summer; brown in winter. On petiole, base or midril) of leaf of white oak 

 (Querciis alba), chestnut oak {Querciis prinus), swamp white oak {Qucrcus 

 plaianoides) and post oak {Qucrcus ',ninor). Common. 



29. Oak "Wool Gall {Aridricus lana Fitch). — Very much resembles a mass 

 of wool about I in. long. White or buff colored, inside with many small, 

 bright chestnut colored, seed-like capsules, crowded together and attached by 

 their lower ends to the vein of the leaf. On the under side of ribs of leaf of 

 ■^•hitc oak {Qucrcus alba). Coinm.on. 



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