Right time of the year. Wrong species of tree for saprophytic mushrooms that eat dead tissue. Many mushrooms grow on pine, but they are mycorrhizal, growing in symbiosis with the tree. Pine has resins that fight fungal attacks, and therefore it's tough to grow them on purpose. Also tough: redwood,
black locust, cedar, giant sequoia. True fir, hemlock and spruce are much better as far as conifers go. Why not just use it for wood chips so that fungi can eat it as a secondary decomposer? It can improve the organic material in your paths or soil in general. Give some time for it to decompose for growing areas.
Sorry,
John S
PDX OR