Gall.
This is an irregular, thick-walled, somewhat spongy, usually monothalamous gall with a diameter of 5 to 7 mm., which occurs tightly packed in Cypress cones. These galls are evidently modified seeds and the shape is determined to a great extent by the growth of those adjacent.

Thick-walled, modified seeds. Fig. 14

Sequoiomyia taxodii

Swollen, aborted seed
Larvae overwinter in the seeds, and adults emerge in spring

Host: Taxodium distichum
Range: Illinois to Arkansas