Frozen spores?

Frozen spores?

Observation - Frozen spores? - UK and Ireland. Description: Walking through my local wood I noticed what looked like remnants of fallen snow on dead tree branches. There was no snow anywhere else in the wood. I returned the following day with camera but being a warmer day - the snow had gone. I returned again to

Walking through my local wood I noticed what looked like remnants of fallen snow on dead tree branches. There was no snow anywhere else in the wood. I returned the following day with camera but being a warmer day - the "snow" had gone. I returned again today with camera and being below freezing the "snow" was back. Looks like frozen spores?