Subject
- Specific Epithet: cancellata 4
- Specific Epithet: capillaceum 4
- Specific Epithet: cyclophyllum 4
- Specific Epithet: fontanus 4
- Specific Epithet: fuscum 4
- Specific Epithet: girgensohnii 4
- Specific Epithet: hallii 4
- Specific Epithet: imbricatum 4
- Specific Epithet: latebricola 4
- Specific Epithet: marylandicum 4
- Specific Epithet: nigritum 4
- Specific Epithet: papillosa 4
- Specific Epithet: pennata 4
- Specific Epithet: polypodioides 4
- Specific Epithet: procera 4
- Specific Epithet: pygmaeum 4
- Specific Epithet: recognitum 4
- Specific Epithet: reflexum 4
- Specific Epithet: rugelii 4
- Specific Epithet: rugifolia 4