In the photo with the scale bar you see an additional fruit body that I have carefully dug out so that the stalk has remained attached to the spore sac. In this species the stalk goes into a small depression on the underside of the spore sac (so the connection has a slight resemblance to a ball and socket joint). In the third photo you see that joint and (arrowed) a slight collar. Note also that the stem has a central hollow along its length.