Stelis drosophila (not my photo)

Common Name: The Dew-Loving Stelis
Scented: no
Light Requirements: partial shade
Temperature Requirements: cool
Blooms: spring
Flower Size: 2mm
Synonyms:

Found in Venezuela, Guyana, Surinam and Brazil in cloud forests in the upper tree canopy at elevations of 1100 to 1600 meters as a miniature sized, cool growing, epiphyte with erect ramicauls enveloped basally by 1 to 2, tubular, scarious sheaths and carrying a single, apicall erect, linear-lanceolate to linear-oblanceolate, obtuse to acute and minutely tridenticulate, gradually narrowing below into the elongate, attenuate, petiolate base leaf that blooms in the late spring on an erect, arising through a conduplicate, spathe, 1.4 to 3" [3.5 to 7.5 cm] long, from near the base, racemose, inflorescence and carrying yellow-green flowers.

Said to be a synonym of Stelis intermedia but I will leave them separate pending more information.