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A neglected jar of Agaricus bitorquis on wild bird seed at about 4 months of age at normal room temperatures. This is a warmth tolerant button type mushroom that I find easier to grow and tastier than the common market Agaricus bisporus.
At first I assumed the lumps were just unformed blobs of mycelium, but after digging them out I could see that they were fully formed mushrooms complete with gills. It is my understanding that Agaricus need the presence of certain bacteria to fruit. Either this jar is invisibly contaminated with stimulating bacteria or this strain or species of mushroom doesn't require it.