I regularly identify slime moulds (molds) on iNat, and usually check the observations every day.
Some species are quite easy to identify, especially if the photos are good enough and they capture the various features necessary for identification, but many require microscopic examination, or SEM.
One of the problems with identifying even the common species is that they change shape and colour as they develop and progress from the plasmodium to the fruiting body stage. If people post only one photo that captures one moment in the development of a slime mould, it makes it very difficult to identify.
I have been observing and photographing slime moulds in northern Tasmania since 2010. I have a website that includes posts with ‘time lapse’ photos that show the development of some species to give an idea of how they change over time. (Stemonitis, Arcyria, Paradiachea), plus it has an illustrated glossary and a key.
The website also includes pdfs of many of the species I have found at my study site.
I have just published the fourth edition of my book “Where the Slime Mould Creeps” and will update details of availability on my website.
I hope it is useful.