Yes, there are poisonous mushrooms that are eerily similar to mushrooms that contain psilocybin. [1] Depending on its stage of growth, they can be easily confused, especially by a newcomer.

There is one main rule to foraging. "Never eat a mushroom you can't positively identify." If any trait of it's appearance is questionable, don't eat it.

1: https://www.quora.com/Is-it-possible-to-confuse-psilocybin-m...