Some types of mycena can excrete milk-like juice, some - glow in the dark, and some - grow hail-like growth! Some types of this mushroom are so rare, they are considered endangered species.
Apparently those white warts on agaric mushrooms are remnants of the universal veil, a membrane that encloses the entire mushroom when it is still very young, making it look like an egg.
Has like a thousand different names like Deadly Galerina or Galerina Marginata, and is apparently one of the most deadly poisonous mushrooms out there. Grows on trees, so... stay away from trees, I guess?
Considered to be the deadliest poisonous mushroom out there, with 1% survival rate (from eating it). Some sites mentioned that it has a sweet taste, and I'm terrified of thinking how they figured that out.