An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
LockA locked padlock
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Image Number D3276-1
Spore-forming pustules of the rust fungus Uromyces salsolae on Russian thistle.
Photo by Dana Berner.
640 pixels wide: (d3276-1.jpg)