Parasitic ascomycete (Neobarya agaricola)

This fungi appears as tiny yellow spines on all surfaces of an agaric fungi.
The spikes were about 1-2mm long.
I suspect the mushrooms being attacked here are some mycena and were up to about 14mm wide; some much less.
I originally thought the spikes to be part of the victim here but noticed them on the gills.
Found in tall, dense eucalyptus rainforest in a national park on an old, mossy eucalyptus log.