Interesting that your myxos also 'don't quite fit published descriptions'. What references do you use? I have Poulain et al, Neubert et al (but I don't speak German) and find Nannenga-Bremekamp's A Guide to temperate myxomycetes very useful because of its extensive descriptions, information about ecological niches and descriptions of similar looking species. Stephenson's Myxos of New Zealand is also useful because of its southern hemisphere focus.
Thanks for 'liking' my various photos. I checked out your link to the NE Fungus study group and interested to see the variety of myxos you find in the UK. I find some of the same species in Tasmania but a few (e.g. Cribraria violacea) I have never seen. Unfortunately there is still not a field guide to myxos in Australia so I'm using northern hemisphere texts. Apparently Aus and NZ myxos 'don't quite fit published descriptions', which makes identification difficult in many cases. I'll persevere!