| The details of construction of the sporogonium are referred to below. |
| The young sporogonium is protected by a thick calyptra derived from the tissue of the thallus around the archegonium. |
| In none of the liverworts does the sporogonium develop by means of an apical cell, as is the rule in mosses. |
| With the possible exception of Archidium, the sporogonium is throughout the Bryales constructed on one plan. |
| Fertilization takes place about June, and the sporogonium is fully developed by the winter. |
| The perianth serves also to enclose and protect the sporogonium during its development. |
