Coprinopsis stangliana
Distribution: This fungus is thought to have been introduced to Western Australia from Europe in the 1990s. It has been reported in scattered locations in WA from Carnarvon to Witchcliffe.
Description: This species has been found growing in leaf litter or weedy areas. The caps are up to 125 millimetres wide.
References: Florabase https://florabase.dpaw.wa.gov.au/nuytsia/article/451
Atlas of Living Australia https://bie.ala.org.au/species/https://id.biodiversity.org.au/node/fungi/60095115#overview