Description Scientific Name: Hypsizygus ulmarius Classification: Edible Cultivation Difficulty: Easy Substrates: Spawn bags; Straw; Wood chips, sawdust; Newspaper, cardboard Temperature: Colonizing / Fruiting – 70-80 / 55-65 Strain Origin: N. America; Europe Potential health benefits: anti-inflammatory, magnesium, fiber, vitamin D, antioxidant, skin health, energy booster, lower cholesterol and anti-bacterial! Description: Liquid Culture. Elm Oyster Mushrooms are a great non-meat source of protein, rivaling beans and any other vegetable source. They are low in available carbohydrates and have less than 5% dry weight fats. Depending on the substrate on which they grow, Elm oyster mushrooms can contain a number of essential minerals including magnesium, iron, manganese and zinc.