Synonyms: Acianthera casapensis; Acianthera chamensis; Acianthera coffeicola; Acianthera harpophylla; Acianthera phyllostachys; Humboldtia casapensis; Humboldtia chamensis; Humboldtia harpophylla; Humboltia casapensis; Humboltia chamensis; Humboltia harpophylla; Humboltia polystachya (heterotypic); Pleurothallis casapensis; Pleurothallis chamensis; Pleurothallis coffeicola; Pleurothallis harpophylla; Pleurothallis phyllostachys; Pleurothallis triangularis; Pleurothallis triquetra (heterotypic); Pleurothallis wolfiana; Stelis polystachya (heterotypic)