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A very curious organism (organisms?). Research points to Entoloma abortivum parasitizing Honey Mushroom (Armillaria mellea), although previously it was thought that the reverse was true. Either way, there is a relationship between two different mushroom species that leads to this form of the mushroom. Normal Honey Mushrooms and Entoloma abortivum look like the classic parasol mushroom with a distinct cap and stem. However, the parasitized ones do not fully form and take on a somewhat spongy texture. The texture is also likened to shrimp, hence the name, and is often used in recipes in place of shrimp are when consumed.
At the base of a rotting log covered in moss. They are typically found on decaying wood such as this
I believe the parasitized, or aborted forms are sterile, as they do not fully form the caps, gills, or other forms of hymenium. However, I cannot find any sources online confirming, perhaps because that is obvious from the lack of spore-bearing structures.