The Branching Oyster (Pleurotus cornucopiae) was found at two locations in 2012. A large decaying tree stump near Pet’s corner has produced large flushes for at least the last couple of years.
This large dead tree trunk further north in the Dene also produced a large flush.
This mushroom on first sight looked like the Hare’sfoot Inkcap, Coprinopsis lagopus but as the immature fruitbodies are brown rather than grey it could be Coprinellus impatiens. Update: I now think this is Parasola leiocephala