Strange yellow 'wasp nest' feature on string of pearls plant.
I have just noticed a strange yellow lump on one of my string of pearls plants. It looks like a yellow wasps nest but it's sitting on the pearls and not hanging downwards as they usually do. It's also a different colour. I am sure it wasn't there yesterday as I am sure I would have noticed it! Can you please tell me what it is? Is it a fungus? Is it harmful or can I leave it alone?
It lives in a warm conservatory on the window sill.
I would really appreciate your advice.