Please can anyone help me with this one?

Please can anyone help me with this one?

Observation - Please can anyone help me with this one? - UK and Ireland. Description: Found in my border. About 4cm in diameter and approx 7cm tall. Also seemed to have a ring on the stem. Hope someone can help. Thanks.

Found in my border. About 4cm in diameter and approx 7cm tall. Also seemed to have a ring on the stem. Hope someone can help. Thanks.