Edible, therapeutic and toxic mushrooms
23
ELM OYSTER
Hypsizigus ulmarius, Pleurotus ulmarius
Frequency
Frequent
Habitat
This mushroom fructifies in October, mainly on the trunks of ashes and a wide variety of deciduous hardwood. Along roads and highways after the leaves fall, one can see their fruit bodies decorating the trunks of trees.
Cap
Fruit bodies generally appear alone or in groups of two to five, rarely more, close to the ground or higher up. The top of the cap is often cracked.
Margin
Inrolled at first and then spread out, even.
Gills
Adnate, white, creamy yellow with age.
Stalk
Centered to slightly offcenter, usually curved. White to yellowish, variously striated longitudinally.
Flesh
Thick, white.
Unfit for human consumption
Its main enemies are sun and wind, which dry the borders of the caps, affecting their appearance and quality. Fruit bodies with flesh that has become rotten and soft should be left on the trees.
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The fungus enters the tree through a wound and develops in the dead part of the wood inside the trunk. Each year, a new ring of wood is added under the bark. Within the trunk, another ring dies, giving the fungus an additional ring of wood to decompose. Thus, the mushroom can live a long time, although the tree eventually becomes completely hollow.
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