Schizophyllum commune! Also known as split gill. Fun fact this is not poisonous, some countries consider it a delicacy. BUT!! it has been known to colonize in peoples mouths and throats, causing mysterious growths. Strongly suggest not eating it or it may just eat you back.

Edit: apparently also avoid getting too close or sniffing it. We’ve only had around 100 cases since 1950. But the most recent case study involved a 25 year old woman who had symptoms of rashes, growth nodules, lesions, and pain. When they cultured a biopsy of her skin 7 days later, they found it to be schizophyllum commune. SpoooOoOoOoky.

I believe this is called a Split Gill although I have never seen one in person.

Any idea what this is? Manhattan, US