Regeneration images

My back garden is full of mushrooms today (Oct 3).  Not sure whether they are edible or not - any ideas?  They look to be in a line suspiciously where the ants nests were in the summer.  I must research this, because I know that other types of ants "farm" the mushrooms in a symbiotic relationship.

Are these structures on my lawn essentially enormous bio-silos of ant food on the ant-scale landscape!?

Latest: Matthew at "Mushrooms.org.uk" says its a Paxillus involutus aka common or brown roll-rim.  He says I shouldn't be eating it!  My desk research suggests there is no ant farming going off, but there is a symbiosis with tree roots, including birch. There is an introduced Himalayan birch (Betula utilis Jacquemontii) nearby and what a beautiful sculptural specimen that is). However, I'm loathe to dig up the lawn to try and prove that association... Damn lawns, they take up so much time to get right.