Hi there,
Well there is always the possibility of something new turning up- if you dont look, you dont find. Contact NAMA(
http://www.namyco.org/contact.html) and ask them how you could go about sending a specimen for possible identification. If they do want a specimen, they'll want it dried- the microscopic characteristics will be preserved.
Chances are that its not Colllybia Fusipes and something else entirely. On the positive side, if they do accept a specimen and get it positively ID'd then that is another species that you will know.
Mark
