It's a while since I showed this macro photo and asked if you could guess what it was:
Some wider views of the same object:
As should be obvious now I was looked at the underneath of a fern frond and the yellow blobs are sporangia - where the spores will be produced.
Congratulations to Wilma who deserves a for spotting they were spores under a fern frond and my thanks to all who had a go and made a guess.
9 hours ago