Hi @Ben Caledonia A coprinoid, perhaps genus Parasola. You have P. plicatilis in your region, but there may be similar species.
Thank you very much @Frog , you are right it is indeed a Parasola! I looked in more detail, in my opinion it is not P. Plicatilis, because the latter has more yellow / brown tints in the center of the hat. On the other hand on "Endemia", I found the reference of Parasola sp 'griseofloccosus' which seems to me to correspond very well, a species which is not yet officially named. On the link as well as below, appears the description of the Australian Patrick Leonard. ("grey floccose stipe") Endemia.nc Cap: convex becoming planoconvex; 10-20 mm diameter; radially sulcate striate, with velar remnants; surface gray, velar remains white; margin plicate. Stipe: cylindrical, hollow; 50 - 100 × 2–4.5 mm; floccose; gray with white floccules. Gills: adnexed; white at first, brownish then black at maturity. Spore print: blue black. Notes: this Parasola is characterized by its radially sulcate gray cap with scattered white veil remnants and gray floccose stipe. It may be in Coprinus, further work needed. Patrick Leonard 2019
