I think I found a petrified mushroom - Fossil ID - The Fossil Forum
Porcini Mushrooms Natural Rock Formation In The Form Of Huge Fossilized Mushroom Silhouettes Near The Village Of Beli Plast Bulgaria The Natural Phenomenon In The Mountains Is Characterized By Delicate Pink Stems
Researchers Have Found a 115 Million Year Old Mushroom
VTG Large Petrified Mushroom Caps On Wood Natural bark Chunks Of Wood Box OOAK | eBay