Eriophyes u-thomasii-frost-gall
The inducer of this gall is unknown or undescribed.
Family: Eriophyidae | Genus: Eriophyes
Hosts: Ulmus thomasii
Detachable: integral
Color:
Texture: erineum
Abundance:
Shape:
Season:
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Alignment: integral
Walls:
Location: lower leaf, between leaf veins
Form:
Cells:
Possible Range:i
Common Name(s):
Synonymy: 
Image by TD Jarvis © 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.
Insect Galls of Ontario
“
Eriophyes sp.
It differs from the frost mites on Hard Maple and Beech, in that it does not consist of a mass of spherical granules, but of a mass of tangled threads which under the lens are seen to be arranged in very beautiful star-like clusters. The mites are easily found among these. The patches are found on the under side of the leaves betwen the ribs. Occurs on Rock Elm (Ulmus Tacemosa). Common
”- TD Jarvis: (1906) Insect Galls of Ontario©
Reference: https://www.biodiversitylibrary.org/page/40931581#page/314/mode/1up
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See Also:
Unless noted otherwise in the ID Notes, observations of this gall are collected in the Observation Field Gallformers Code with value u-thomasii-frost-gall on iNaturalist. You can view them here:
