| For the microgametophytes, he sowed whole microsporangia on filter paper. |
| The pollen organs are synangia, each consisting of a ring of microsporangia united at their bases around a hollow center, a common feature among so called pteridosperms. |
| In pollen cones, microsporangia are borne on a single bract without a trace of a second, subtending structure. |
| The male cones have structures called microsporangia that produce yellowish pollen through meiosis. |
| Each anther has four microsporangia arranged in pairs in the two lobes. |
| The microsprophylls of cycads are arranged in strobili and bear clusters of microsporangia on their abaxial surface. |
