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- Pleurothallis ichthyonekys (Ecuador).
- Pleurothallis ignota - now synonym of Specklinia ignota (Luer) Luer 2004
- Pleurothallis iguapensis - now synonym of Acianthera iguapensis (Schltr.) F. Barros 2004
- Pleurothallis illudens (Brazil - Santa Catarina).
- Pleurothallis imago (Panama).
- Pleurothallis imbaburae (Ecuador) .
- Pleurothallis imbeana (Brazil - Rio de Janeiro).
- Pleurothallis imber-florum (Colombia).
- Pleurothallis imberbis (Ecuador to Bolivia) - now synonym of Specklinia imberbis (Luer & Hirtz) Luer 2004
- Pleurothallis imbricata (Brazil - Minas Gerais) - now synonym of Specklinia imbricata (Barb.Rodr.) Luer 2004
- Pleurothallis imitor (Costa Rica).
- Pleurothallis immersa : Black Orchid (Mexico to N. Venezuela) - now synonym of Specklinia immersa (Linden & Rchb.f.) Luer 2004
- Pleurothallis imperialis (Ecuador).
- Pleurothallis implexa (Ecuador).
- Pleurothallis imraei (Trop. America) - now synonym of Specklinia imraei (Lindl.) Luer 2004
- Pleurothallis inaequalis (Brazil).
- Pleurothallis incongrua (Colombia).
- Pleurothallis index (Colombia to Ecuador).
- Pleurothallis infinata (Bolivia) - now synonym of Specklinia infinita (Luer & Hirtz) Luer 2004
- Pleurothallis inflata (Colombia to Ecuador).
- Pleurothallis infundibulosa (Colombia) - now synonym of Crocodeilanthe infundibulosa (Luer) Luer 2004
- Pleurothallis ingramii (Costa Rica) - now synonym of Dracontia ingramii (Luer) Luer 2004
- Pleurothallis inornata (Ecuador) - now synonym of Ancipitia inornata (Luer & Hirtz) Luer 2004
- Pleurothallis instar (Panama).
- Pleurothallis insularis (Brazil - São Paulo).
- Pleurothallis intonsa (Colombia).
- Pleurothallis inversa (Bolivia) - now synonym of Specklinia inversa (Luer & R.Vásquez) Luer 2004
- Pleurothallis involuta - now synonym of Specklinia involuta (L.O.Williams) Luer 2004
- Pleurothallis iota (Ecuador) - now synonym of Specklinia iota (Luer) Luer 2004
- Pleurothallis ipyrangana (Brazil - Paraná).
- Pleurothallis isthmica (Costa Rica to Panama).
Read more about this topic: List Of Pleurothallis Species, Species