Hypsizygus ulmarius Bull. Often the fruitbodies form compact clusters with their stem bases emerging from a single branch scar, and so the stems are nearly always bent rather than straight. Distribution A widespreadbut rather uncommon find in Britain and Ireland, the Elm Oyster occurs also throughout most of northern mainland Europe as well as in other temperate parts of the world including North America. Taxonomic history This impressive fungus was first described in scientific literature in by pioneering French mycologist Jean Baptiste Francois Pierre Bulliard, who gave it the scientific name Agaricus ulmarius. In the early days of fungal taxonomy most of the gilled mushrooms were included initially in the genus Agaricus, the contents of which has since been largely dispersed into many other newer genera.
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All edible wild fungi MUST be cooked. This easy-to-spot mushroom is often mistaken for the common oyster until there is closer examination common oyster gills are decurrent, elm oysters are not decurrent. Ulm refers to "elm" indicating one of the common substrates for this fungus.
Distinguishing Features The colour of the fruiting bodies often depends on its substrate and habitat. Caps can measure anywhere from 5 to 15 cm wide. They are white to buff or tan in colour and sometimes developing a pattern of cracks with age. The stipe is white to off white; dry; smooth; stout; and it develops off-centre to nearly central from the cap. They are often mistaken for being the common oyster. Height The stipes reach anywhere from 5 to 10 cm long and can be 1 to 3 cm thick.
Although the stipe can be 10 cm long, its actual height may not reflect that depending on how to grows. Habitat The elm oyster is distributed all over the temperate climate zones in deciduous and mixed woodland where it grows mainly on boxelder maples or elms. It has been reported that they are found on beech and oak trees as well. Elm oysters are ubiquitous on wounds of living box elders. Spore Print.
Hypsizygus ulmarius, Elm oyster, pleurote de l’orme
The Great Elm Oyster Hypsizygus ulmarius Mix-up Posted on December 13, by Mycognostic September 11, In early October my partner mentioned they had seen a solitary mushroom emerging from a wound in an elm tree on our local trail. This especially interested me because of the Muskoka Mushroom Mystery. I took my camera up there to get some pictures on site before collecting the specimen to clone for possible cultivation. Mystery solved. Perhaps, but this raised another question for me, because I thought I knew the Elm Oyster. I had bought some Elm Oyster H ulmarius liquid culture from Gallboys on Amazon in and I have been growing it quite successfully ever since.