Callirhytis nigrae (sexgen)
The inducer of this gall is unknown or undescribed.
Family: Cynipidae | Genus: Callirhytis
Hosts: Quercus imbricaria / Quercus marilandica
Detachable: integral
Color: yellow, green
Texture: hairless, succulent
Abundance:
Shape:
Season: Summer, Spring
Related:
Alignment:
Walls:
Location: lower leaf, leaf midrib
Form: abrupt swelling
Cells: polythalamous
Possible Range:i
Common Name(s):
Synonymy: 
Image by LH Weld © Public Domain / CC0Our ID Notes may contain important tips necessary for distinguishing this gall from similar galls and/or important information about the taxonomic status of this gall inducer.
On the Cynipidae of the North American Oaks and their Galls
“
Cynips quercus nigrae n. sp.
Quercus nigra [marilandica]
Irregular, elongated swelling on the under side of the midrib of the leaf.
Found two specimens, in June. One of them extends for about an inch along the vein, the other is shorter; both are greenish, and about 0.2 or 0.3 broad. Each gall contained several flies, which escaped between the 20th and 22nd of June, after which the larger gall appeared pierced with nine holes.
”- Baron Osten Sacken: (1861) On the Cynipidae of the North American Oaks and their Galls©
Reference: https://www.biodiversitylibrary.org/item/22852#page/86/mode/1up
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