Habitat
Agaricus trisulphuratus is a saprophytic species growing in organic rich soil and well decomposed tree stumps. It grows in grassland and forested ecosystems in rich organic soil and well decomposed tree stumps.References:
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https://www.inaturalist.org/guide_taxa/1680692#:~:text=Agaricus%20trisulphuratus%20is%20a%20saprophytic,forest%20and%20Maasai%20Mara%20ecosystem.