- 1. Fern prothallium w.m. Lieder_2625d
- 2. Fern prothallium, young filamentous stage w.m. Lieder_Pt151d
- 3. Fern prothallium, with antheridia w.m. Lieder_Pt152e
- 4. Fern prothallium, with archegonia w.m. Lieder_Pt153e
- 5. Fern prothallium, selected to show antheridia and archegonia w.m. * Lieder_Pt154f
- 6. Fern prothallium, section with antheridia Lieder_Pt155d
- 7. Fern prothallium, section with archegonia * Lieder_Pt156e
- 8. Fern prothallium, older stage with young sporophyte and root w.m. * Lieder_Pt157g