Virtually all mushrooms that appear growing with houseplants are harmless saprophytic fungi that live off of dead organic matter - the peat, coir, bark, compost, etc. - in the potting soil. But they can also be an indicator of overwatering or excessively moisture retentive soil media.

Just pull them out if you don't like or they will disappear on their own in a few days.

Hi, Emily - what Pam said, +, plants have evolved to live side by side with thousands of species of fungi, some of which plants for beneficial relationships with (symbiosis) and a few of which are pathogenic. What you see are simply the fruiting bodies of whatever particular fungi has found conditions in the pot favorable enough to fruit. Unless there is a fungal infection by one of the fungi commonly grouped under the umbrella of "damping off diseases", there should be nothing to be concerned about. The damping off diseases are usually the result of too much water and not enough air in the grow medium. Yours are actually quite attractive, what with the stark contrast in color and texture/ shape. The 'cute factor' will wane as they start to go over (fade); but, as long as you have them, there is no notable benefit to either keeping them or removing them. Rest easy.

Al

pam who?

Me Pam :-) I have known Al for a very long time and we are on a first name basis.