Mushrooms?

Hello all, I started growing quite a few mushrooms on my vegging plants. They are growing out of the drain holes and around the circumference of the pot on top. My flowering plants and my clones which are both in the same soil do not have any. My veg plants are on top of a wooden dresser under 24hrs light supplied from 4 t5 fluorescents. There is airflow and the room is usually at around 70f and 55%rh. Are they going to harm my harvest at all? Here is a pic of what they look like. Thanks in advance.

These mushrooms (inky caps) won't hurt nothing but if they grow to that size your humidity might is too high and that really could damage your flowering plants as rot could form in the buds.
Fungi growth in soil is a positive thing though - the hyphae moves water and nutrients through the medium and even out the content of those elements in the soil. Don't wash your pot with bleach of fungicide as you don't want to get rid of them.

Check the RH where the mushrooms grew and if its below 60% just ignore them. Maybe you should water less often too.
Don't eat these mushrooms, they don't taste good.
Mushroom growth also indicates low EC levels in the medium, meaning your not overfertilizing, which is good.

Wow nice to know. I don't actually have a thermometer/barometer where the plants are vegging because I'm using it for flowering right now. I used to have it in there and everything stayed in normal ranges so I figured it was okay. It's been raining where I live though so I'm sure the humidity is in the 60s at least. I'll check it out and try to bring it down if that's the case and see if they still keep coming back.

if they are vegging and the RH is below 70% you shouldn't worry about it.