Meanwhile, here is a very short video I've come across on the web about better mushroom photography.
I'd love to follow the tips in the clip, and I agree that they would greatly improve image quality. However, the problem for me is that the sheer amount of equipment you need to carry with you is off-putting. You can either carry the photography gear, or mushroom-collecting gear, but not both. So within mushroom-collecting season, this is only viable to me with a willing assistant. But in times when expectations to find something edible are low, and therefore I'm not burdened with baskets, containers, knives, guides, repellents, etc. etc. - it's certainly worth a try.