What a surprise! Haven’t ever seen this species in my garden (or at all actually), and wasn’t really expecting anything much in December. But there’s often fungal things appearing in my pots. (I particularly like the Bird’s Nest fungi, but none this year unfortunately.) I’m not very good at identifying these little brown things…, but I think it’s probably Conocybe dentatomarginata, mainly because it look exactly like the picture in Buczacki although this identification is rather tentative. (A web search for images of Conocybe dentatomarginata produces almost nothing, which is a bit surprising.) Could be a Galerina of some kind instead?