Brown strings from the mouths of my mushrooms

[rocketlily]

Two of my mushrooms have produced stings of some sort from their mouths tonight. They are brown in color. Does anyone know what this might be?

[sharuq1]

poo

[rocketlily]

If it was coming from my pond fish I would have known what it was. Do mushrooms really do this?

[andresont]

usually means stress, or not enough or to much light.
water change is your best friend.