I thought that, or a gill/spore pattern print might be needed. Unfortunately I couldn't get a decent photo from underneat, and unless I was on a work/approved survey, I don't do pick/print/press collecting. Thank you for the ID within the limits of the photos.
A small mirror can help you look at the underside of your fungus without needing to pick it. With a bit of practice you will, at times, be able to get good photos as well.