Poplar Rust?

Poplar Rust?

Observation - Poplar Rust?. Description: A rust on a Poplar, I think Black Poplar, same tree as in this post: http://www.ispot.org.uk/node/286071

A rust on a Poplar, I think Black Poplar, same tree as in this post:

http://www.ispot.org.uk/node/286071