The spiky spores look like they have apiculi. Did you find any basidia? If there are no basidia, do you think the spiky spores are just accidental visitors?
A vertical cross section through the “wart” might help to identify whether it is an asco, but I realise it is probably an impossibility with dry material. If any more turn up in fresh material we would try embedding some and taking a vertical slice.
Cheers,
John