Reply To: IDENTIFICATION PLEASE
An afterthought: Have you dug down into the cells to see what is there? It could be mouldy pollen. Usually, this just goes dark/black on the surface but I noticed that some of mine has started to grow a white mycelium, not unlike your photo – maybe this strange damp autumn has encouraged a different kind of fungus. I don’t usually do anything about it – the bees clean it up in the spring