Identification: Can someone identify this mushroom?

This mushroom grows in my flower pot, and i want to know what it is.
That thing next to the mushroom is not part of it (pic 1,3).

 

Marasmius oreades? http://www.google.ca/imgres?q=Marasmius+oreades&um=1&hl=en&sa=N&tbo=d&biw=1005&bih=595&tbm=isch&tbnid=eGW1Gg-Lc-CwFM:&imgrefurl=http://commons.wikimedia.org/wiki/User:Archenzo/Images&docid=7Fp2fBSIL0ug5M&imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/MarasmiusOreades.jpg/331px-MarasmiusOreades.jpg&w=331&h=250&ei=RWO6UNGmKtGVjAKbgIG4Aw&zoom=1&iact=hc&vpx=706&vpy=16&dur=22&hovh=195&hovw=258&tx=155&ty=113&sig=108667131750353997408&page=4&tbnh=134&tbnw=177&start=54&ndsp=20&ved=1t:429,r:68,s:0,i:293
Is the stem hard to touch and fibrous? Is the spore print white?

 

thanks for reply
hmm i don't know about spores, but the gills are brown almost the same color as the cap, little lighter.
The cap doesn't have that darker spots like the mushroom in the picture you showed me, its just one color, also the stem is darker at the bottom.

 

The expert I turn to identified this as a Conocybe, quite possibly Conocybe siliginea.

 

Thank you, now i'm almost sure its http://www.google.com/imgres?um=1&h...75&start=36&ndsp=43&ved=1t:429,r:55,s:0,i:284

 

the link you give is to a Psilocybe, something you most certainly don't have.

 

it looks identical

 

the species you think it is only grows in clayey soil in Mexico. the species i cited is known to be common in potted plants.

 

ok, thanks for info