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What gall is this?

his usual spot, a glorious Pyrrhuloxia in the fir on the west side, singing full-throated to the morning sun, and a shy Abert’s Towhee hopping around in the same tree. Lesser Goldfinches were singing all around.

This is the same gall I saw on a Whitethorn Acacia in October (link), this time on a Catclaw Acacia. It would be nice to know what it is.

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About Bill McCallum

I was born in Australia and came to the United States to pursue a Ph. D. in mathematics at Harvard University, met my wife, and never went back. I am a professor at the University of Arizona, working in number theory and mathematics education.

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