Photo credit: “Margaretbarromyces dictyosporus gen. sp. nov.: a permineralized corticolous ascomycete from the Eocene of Vancouver Island, British Columbia”: Randal A. Mindell, Ruth A. Stockey, Graham Beard, and Randolph S. Currah.
This picture shows a cross section of the fruiting body (ie, what would be recognizable to us as a mushroom) of Margaretbarromyces dictyosporus, showing spores within specialized cells. The bar at the bottom of the image is 100 μm long, to give you a sense of how big this fossil is.
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