You can prefer what you wish. But like I said I started with the white paper to photo as many samples on a group foray as possible. There was a lot of material brought in on these things, hundreds of samples in some cases, and then we look for a couple hours and toss them all out. I wanted to save something from the lot to get to know things better, and to be able to compare what we call something one year to what we would call it the next. In this case, there is no “in situ”, the situ is the group foray lab room, there isn’t anyway to take all the samples back into the field where they might have been found for a photo. Since they are already separated from their env. a neutral background was preferable, and useful.
Personally I think for all taxa it would be good to see a good photo in situ, and another good photo on a neutral background in a controlled setting. The second usually gets more detail and provide further info on the mushroom itself. But it does mean more work for me getting photos twice of everything if I can, but that is just me…