The sporangia are typically clustered into a sorus (pl., sori). The underside of the leaf has many rounded sori containing the sporangia. Like other members of the Pteridaceae, the frond margin is reflexed over the marginal sori. The sori are marginal on the pinnules. Sporangia are formed in sori on the underside of the frond. Spores develop in sori on the underside of the fronds. The fern has spores on the bottom of the fronds, contained in sori. Tetraspores occur in scattered patches sori (spores) on the mature blade, diploid blade. Fern spores are contained in structures found on the underside of the leaf called sori. They bear long, narrow sori which contain the spores. Abdul-Rahman (Prince Sori), wrote two autobiographies. Captured in Africa and enslaved in Mississippi, Abdulrahman Ibrahim Ibn Sori was a Fulani prince. In July 2017, Sori and Yamada said a sequel was in development. On the underside of the blades, the sori (reproductive clusters) are round, discrete, and sunken. Spores develop in sori which occur over the central part of the blade.