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Blue oyster mushrooms growing in a kit
(leminal.space)
Update: The first photo was day 3 of growing. We harvested on day 4, and got 255 grams of tasty snack! 
The kit is from Mushbarn in Grass Valley, CA. We picked it up while we there for a visit. https://mushbarn.com/products/new-mushroom-grow-kit-blue-oyster