[Felt is describing the leaf gall; use arrows at right for flower gall description]

A somewhat flask-shaped or subconical, solitary or confluent white pubescent leaf gall, diameter at base 2 mm., height 3 mm. ... [T]he basal portion of the gall [is] thick-walled, with an oval cell having a length of about 1.5 mm. and a distal tubular, thin-walled portion separated from the larval cell only by a thin, matted layer of filaments, the top being light filled with a curled, woolly mass.

- EP Felt: (1916) New Western Gall Midges^©