this is why i would suggest you use a media... instead of a soil ... or a compost ... and also why i would sterilize my media before using ... see link i dont know the name.. its irrelevant .. you are getting them.. because you are using 'unfinished' compost in your gizmos ... mushrooms are one of natures decomposters.. and when you use an unsterilized media.. that has vegetative material.. and mushroom spores.. when you add water.. you get shrooms .. see link for a very easy way to sterilize your stuff when i did seeds... i started things in flats.. one line per plant ... and transplanted into 6 oz solo cups at the first true leaf stage ... i sterilized the cups also ... and wrote name on them with sharpies.. and reused them every season after a wash in 10% bleach ... i sliced the bottom edge in 3 place on each cup for drainage ... below is a pic of a couple hundred under common fluorescent shop lights ... oops... forgot.. this is the name that plant forum... some of them might get upset i am actually talking about plants [or argue that a mushroom is not a plant, rather a fungus.. lol] ... i hang in the annual and perennial forums should you wish to further this discussion .... might find some other peeps there who can help ... good luck ken Here is a link that might be useful: link

Should not be a problem. Actually is usually very good. Obviously you have invited a saprophyte (=lives off of dead material) into your garden, by adding the cotton hull waste. Whether the mushrooms you have are edible or not is another matter. In my opinion it is beneficial to have mushrooms. Very few will attack garden plants (none I know of), but at the same time they help to reduce the stress on your garden plants by connecting the mulch together with their mycelium strands. This seems to effectively widen the reach of your plants' root systems. Most mushrooms are very beneficial organisms. Generally, we have the Brits the thank for our "fungal phobia". Most other ethnicities regard fungi as something good. A large majority of mushrooms are not poisonous. Respect them, they do an extraordinary job. Just don't eat any that you are not absolutely positive of-- and be sure to always cook the ones you do know. There is some good info in "Mycelium Running: How Mushrooms can Help Save The World" by Paul Stamets. And lots of good websites on the subject, just do a google search.

Coprinellus micaceus

Oh for crying out loud. Did this get posted to the wrong forum? If so, my apologies. This was supposed to go to the mushroom forum on Gardenweb. Looks like it might have accidentally gone to the fern forum. Rats. Not sure how that happened. I'll try to repost.