Have you ever seen those globes that you fill with water and put some roses in and then invert?
you could try that with mushrooms but I'm not sure what you'd put in...water is right out,it'd just start growing funky stuff in it
olive oil maybe? or glycerin or isopropal alcohol.
I know there is a way to preserve them in oil so you can eat them later and you can pickle mushrooms.
Isopropal alcohol is pretty cheap about $2 per liter..it's clear and it is used to preserve bugs parasites and tissue samples.
Formaldehyde would work too but it causes cancer and may be hard to get.
and mineral oil may work too but it doesn't harm mycelum so the mushroom may stay "alive" might not work if you want to preserve it in a fixed state
try samples in each and see which ones hold thier color the best.
A good set of pictures is probably the easiest to share and store.
put sections and cross sections on a piece of glass and scan them on a scanner for very detailed close up pictures put spore prints on a half black half white piece of paper and scan those too.
I have seen lobster mushrooms too and there were worm like coral growing nearby(coincidence?)
members15.clubphoto.com/peter627123/2597268/guest.phtml I read they were edible or poison depending on what they grew on.mine were not in groups though and I had no other mushrooms growing close that I could ID as being the host.
I suggest you get a camera and take a few pictures...sounds like a great photo opportunity,fields of Lobster mushrooms.They are pretty sturdy they may still be there.