Posted on 7 February 201931 January 2019 by David Oyster fungus on a wisteria Oyster fungus on the fine old vine of a mature wisteria. Oyster fungus are cultivated commercially, destined for the supermarket shelf and the kitchen. They are also a white rot fungus, a fatal parasite on trees and similar woody plants. Post navigationPrevious post: Clumps of snowdrops, Bantock ParkNext post: Magpie on frozen mud, West Park