[Alantb]

Trying to ID myxo's from pictures is being on a hiding to nothing. These look nice specimens but there are a lot of these little stalked things (Comatricha, Physarum, Didymium etc...) and they take a lot of sorting out even when you have them under the micro.
BUT as long as you keep them DRY and open to the air they will remain in this state for years. So what I advise is that you keep a sample in a matchbox (remember those?) or similar until you find someone handy who will look at it for you. One technique is to take a bit of the substrate bearing the sporocarps and skewer it to a bit of cork or expanded polystyrene with a small mapping pin so that the actual myxo remains clear of the container.
[As a guess these may be Physarum leucophaeum - but don't quote me!]
Best of luck, Alan