Marchantia polymorpha, enlarged approx. 10 times, in SOMSO-Plast®. After Prof. Dr. W. Weber. Thallus with three gemma cups each containing gemmae. The thallus becomes either male or female by attaching the two antheridial or two archegonial branches. One antheridial branch has been cut vertically and one part of it can be removed. Separable into 5 parts. On a green base with explanatory note.