1 88 DAVENPORT ACADEMY OF SCIENCES. 



SYNOPTICAL TABLE OF GALLS. 



Group I. 



Galls thin, paper-like, more or less transparent. 



The galls produced by the species of this group are quite variable, both 



in shape and coloration, and often difficult to separate, especially when 



several galls of closely related species grow upon the same leaf. So far 



twelve distinct forms belonging to this group have been discovered, of 



which seven have been found growing upon Hicoria a^leci and glabra in 



the vicinity of Washington. The fully developed forms of most of them 



are quite readily separated, though intermediate or dwarfed forms occur 



frequently. 



Section 1. Opening above. 



1. Projecting more or less conically above and beneath ; both nipples 



surrounded at apex by a fringe of long filaments. 



Ph. c.-septum (Shimer). 

 Both cones very much elongated, slender and toothlike. 



var. perforans, n. var. 



2. Conical above, flat beneath ; splitting into several bracts above 



when mature ; with slender filaments at the centre beneath. 



Ph. c.-foli(s Fitch. 



3. Similar to c.-septum; smaller, more flattened, but slightly 



convex above and beneath ; opening round or oval, sur- 

 rounded by short, recurved pubescent bracts ; a minute 

 closed nipple beneath Ph. picta n. sp. 



4. Smaller, though similar to c .-picta; more convex, and often 



with a slight depression above ; no opening above before 

 maturity ; a minute closed nipple beneath .... Ph. intermedia n. sp. 



Section 2. Opening beneath. 



5. Convex, more elevated above than beneath, with a reddish or 



crimson fovea or dimple above, varying in depth. The ori- 

 fice beneath small and surrounded by a fringe of short, flat 

 bracts Ph. foveola n. sp. 



6. Concave above, convex beneath. The nipple formed of rather 



long, slender filaments. The depression above as well as the 

 surface beneath, including the filaments, provided with long 

 white hairs Ph. pilosula n. sp. 



7. Size small, slightly convex above, more prominent beneath. 



Usually with a small, shallow depression toward one side, 

 above. Nipple short, without bracts ; the orifice more or less 

 oval and fringed with short pubescence Ph. deplanata n. sp. 



