We have just finished compiling 18 months of data regarding several types of fungi that seem to be affecting bearded dragons from multiple case studies and written a summary.
In many cases the same fungus was found and what we believe what may be the cause of it.
The link to the article:
Yellow Fungus - Possible Cause and Effects
One type still eludes us as it is particularly deadly and although we also found this one in bearded dragons that had previous treatments with medications, that we think are causing the other fungal problems, without credible research on that one we can not say that the catalyst exist in their natural fauna like the other fungi. That one is Chrysosporium anamorph of Nannizziopsis vriesii, but there is a researcher also working with it and hopefully he will have more information soon. From what we are reading in the data, this one appears it may be originating in soil.