The best way to tell is to slowly lick the tip. Then, gently slide it into your mouth and lick the shaft of it, gently, ever so gently, as it gets close to the esophagus to sort of meter the descent. Then, just jam it straight into your windpipe and call it a whore, a dirty dirty whore and maybe punch the base and slap your face around a little, sometimes with your hands, sometimes with the mystery mushroom. And then you take a pic of the shroom and google image search to get an idea, and then verify against whatever shroom directory that is out there. No need to thank me... I'm here to halp.