what is this?

Kermit, TX(Zone 7b)

This is on my cottonless cottonwood tree,,, does anyone know what this is???

Thumbnail by leeann6
Churchill, Victoria, Australia(Zone 10a)

It looks rather like one of the rust fungi. I tried searching for poplar rust fungus and found these:
http://www.glfc.cfs.nrcan.gc.ca/treedisease/conifer_aspen_rust_e.html
http://www.ipm.uiuc.edu/diseases/series600/rpd605/

Kermit, TX(Zone 7b)

Thank you so much,, I never would have thought it was a fungus! Learn something new everyday! thank you again for your help.....

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