galls on Cascade asters

August 20, 2019Pacific Crest Trail, Goat Rocks WildernessLewis County, Washington

Coordinates: 46.45868,-121.43144 (click for map)
galls on Cascade asters (Eucephalus ledophyllus (Aster ledophyllus)) [Pacific Crest Trail, Goat Rocks Wilderness, Lewis County, Washington]
Filename: 20190820-155842.jpg 2831x4247 pixels, ISO 125, f8.0 @ 1/125 sec
Eucephalus ledophyllus (Aster ledophyllus)

The galls are probably from a midge.

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