Tony,
"Public land" is defined as lands that are held in trust (for American citizens) by the Federal Government. The Federal Government has designated and directed various government agencies to manage this public land.
So the USFS and BLM do not "own" this public land, they just have been directed to manage it.
The Federal government also does not own this land. We The People own this land.
I believe the correct term would be "Public Domain Lands"