Bulbophyllum hirundinis (Species)
Found in Vietnam and Taiwan on tree trunks in forests at elevations around 500 to 3000 meters as a miniature sized, warm to cold growing epiphytic species with small, grooved, ovate pseudobulbs carrying a single, apical elliptic to elongate-elliptic, coriaceous, subacute, narrowing below into the shortly petiolate base leaf that blooms in the summer on a basal, 2 3/8" [6 cm] long, slender inflorescence that has an apical umbel of several [4 to 10] flowers.
This species needs warm to cool temperaures, a fast draining medium, partial shade, good air movement and ample moisture to grow well.