One of the commoner Poisonpies generally associated with conifers and pines in particular, but also many other trees and shrubs. Extremely variable both in macro and micro characters, and has had several varietal names in the past

References: 
Vesterholt - The Genus Hebeloma
Knudsen & Vesterholt (2012 second edition) - Funga Nordica
Breitenbach & Kranzlin - Fungi of Switzerland