Hypsizygus ulmarius

A late season cousin to the Oyster Mushroom, the Elm Oyster is a slow growing and very durable mushroom. Typically fruiting from wounds on boxelder, it can be watched as it slowly grows over the course of several days. It may take ten days to reach full growth. It will then begin to develop the characteristic cracks in the surface. If left undisturbed it could remain on the tree for several weeks.

While it resembles the common Oyster Mushroom, it is noted for having a prominent stalk that is off center to nearly central. Its gills are attached but not decurrent. It has also been known as Hypsizygus tessulatus, but recent studies by Scott Redhead indicate this name belongs to a smaller mushroom.

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