| The number of spores produced per sporangium ranges from 16 or 32 in some pteridophytes to more than 65 million in some mosses. |
| Each sporangial complex is born on a branch system that dichotomizes twice, with each resulting branch tip branching pinnately and ending in a sporangium. |
| The dark red granules of the sporangium walls are abundant and appear to form a continuous crust. |
| The cysts, then, belong morphologically to the peridium or sporangium wall. |
| The manner in which the spores originate in the sporangium calls for comment. |
| The wall of the sporangium is exactly like that of certain species of Diderma. |
