| Micrograph No. | Family | Scientific name and Author(s) | Aperturation | Ornamentation |
| 553, 554 | Convolvulaceae | Ipomoea amnicola Morong | periporate | echinate |
| 555, 556 | Malvaceae | Callirhoë involucrata (Torrey & Gray) Gray var. involucrata | periporate | echinate |
| 557 | Malvaceae | Gossypium hirsutum L. | periporate | echinate |
| 558 | Malvaceae | Malachra capitata (L.) L. | periporate | echinate |