Not sure why but this particular houseplant that I’ve brought out to summer on the deck has a penchant for attracting bright, unusual mushrooms. These just popped up since last night. I realized I should snap them before they go. The last ones – odd looking fellas – lasted barely a day.
revelgardener 
From what I’ve understood listening to some gardening shows, the mushroom is actually the fruit of the mycelium (had to look up the spelling). The ‘problem’ is not the mushrooms but the mycelium in the soil which is producing the mushrooms. My big banana plant grows mushrooms now and then, but usually they vanish once the sun hits them. A little reading on the subject:
http://en.wikipedia.org/wiki/Mycelium