Spotting

But I appreciate your dedicated help much, of course.

Thanks for the suggestion, Longmustache, but I am not so sure about it.
Typical for the spotted one is the bright ring around the cap's edge. Which is missing on the pictures I saw about the Pholiota lenta.
Plus, the stem's texture on my spotting is plain, while the one of the Pholiota lenta is roughfly textured.