A thin smear on some rotten wood, this turned out to be very nice under the lens
The most obvious thing of note was the long capitate septo-cystidia with occasional clamps. They stuck out like a sore thumb (literally?)
Here's one of the clamp on the cystidial septa, with a bonus basidium appearing above it:
And here is the second cystida type - a lagenocystidium - to the left of the measure:
Spores were thin-walled, hyaline, j- and 5-6u long, c.3-3.5u wide
It has been called Peniophora and Grandinia in the past. And Odontia. And Kneiffiella ...
I did kind of expect it to be a Peniophora though