The mushrooms in the photo were found in the high altitude tundra in the Yukon Territory, Canada. They are possibly Russula emetica which is a colourful but inedible fungus, otherwise known as the "vomiting Russula" .
Russula species are thought to be mycorrhizal.
In other words they form a beneficial (mutualistic) association with the roots of woody and herbaceous plants. The fungus facilitates the uptake of nutrients (particularly phosphates) by plant roots. In return the fungus receives sugars (energy) from the plant.
For more information see:
en.wikipedia.org/wiki/Russula_emetica
Photo taken August 2019, Yukon, Canada.
Camera: Olypus EM5 MkII
Lens: Meyer Optik Görlitz Oreston 50/1.8 (1960's twin zebra version; M42)
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