| The sporogonium when nearly mature bursts the calyptra irregularly. |
| The sporangium differentiates after the seta elongates and is protected from injury and drying by the calyptra. |
| The young sporogonium is protected by a thick calyptra derived from the tissue of the thallus around the archegonium. |
| The calyptra is half-cleft, and expanded as if blown out below. |
| The capsule is often covered by a calyptra, which is the enlarged remains of the archegonium. |
| In most liverworts, the sporangium matures before the seta elongates, pushing the sporangium above the calyptra that protected it. |
