Handful growing on mulch. This was only one not deliquescenced

Spores black and have germination spore.

https://www.mushroomexpert.com/coprinopsis_lagopus.html states that "Pleurocystidia enormous; variously shaped; 70-150 x 20-60 µ; cheilocystidia similar.'

Have captured what I think is the cystidia. Very visible even under 450x magnification. Eyeball guess (very unreliable) puts the ratio between spores ('Spores 10-14 x 6-8.5 µ') and cystida to be approximately correct.

Also found other weird looking things, might be contamination of sample, or just random stuff.

Stain was two part dentists for plaque. Red for fresh plaque (one would assume sugars) and blue for older plaque (one would assume carbohydrates).

Stain flushed with KOH and mounted in KOH.