Andricus ignotus

Family: Cynipidae | Genus: Andricus
Detachable: detachable
Color: pink, red, white, purple, tan
Texture: woolly, hairy
Shape: tuft
Season: Fall, Summer
Location: lower leaf, leaf midrib, on leaf veins
Possible Range:i
Common Name(s):
Diplolepis ignota
Name used by Weld in his Field Notes. Distinct from Diplolepis ignota on rose, used by Weld in his 1959 catalog.
Slide 1 of 3
  • image of Andricus ignotus

New Cynipidae (1881)

Cynips ignota, n. sp.

Small oval cells, found singly or in small clusters of from two to eight together on the under side of the leaves of Q. bicolor. They are sessile on the midrib and principal veins, and usually lie in a position nearly horizontal to the surface of the leaf They are at first covered with short woolly hairs, but when ripe become more or less denuded. The naked surface when examined with a microscope shows numerous minute papillae, and between these a fine and regular reticulation. They are .10 of an inch in length and . 05 in diameter, and might easily be mistaken for the cocoons of some species of Microgaster.

About fifteen years ago I found a few of these galls on the fallen leaves of a large oak and also on a small tree a few rods distant. The next year the greater part of the leaves on the large tree were covered with galls, a hundred or more being sometimes found on a single leaf I gathered a large quantity after the leaves fell, and the flies came out the next spring. I have examined this tree every year since and have never found any of these galls, nor have I ever seen them on other trees.

There are some specimens of this species in the Museum at Cambridge, which Dr. Hagen informs me were found on oaks in the University grounds. I examined some oaks of the same species in the borders of the Botanical Garden at Cambridge last fall, and found several species of galls, but none of these. Can it be that the species has disappeared entirely?

- HF Bassett: (1881) New Cynipidae (1881)©


Further Information:

See Also:
iNaturalist logo
BugGuide logo
Google Scholar logo
Biodiversity Heritage Library logo