SITF confirms that this is Pleurothallis tenuisepala (Jul 2024). Matches the description, photos and drawings in a 2019 Researchgate article: "A new species of Pleurothallis (Orchidaceae: Pleurothallidinae) from Colombia previously misidentified as Pleurothallis luctuosa." The two species are superficially similar, But they can be easily distinguished by the size of the flowers, about 6.0 cm long in P. tenuisepala versus approximately 2.9 cm long in P. luctuosa according to the article. Closely matches photos in the article and orchidroots.com.