Bulbophyllum evasum is an epiphytic or lithophytic herb that has brittle, creeping rhizomes with well-spaced pseudobulbs that are long and wide but mostly hidden under bracts. Each pseudobulb has a dark green, fleshy leaf, long and wide. Between ten and twenty fiveresupinate flowers about long and wide are clustered on the end of a dark red flowering stem long. The flowers are bell-shaped, pink to reddish with dark red stripes and yellow tips and do not open widely. The dorsalsepal is egg-shaped, about long and wide and forms a hood over the column. The lateral sepals are a similar size to the dorsal sepal and the petals are egg-shaped, about long and wide. The labellum is heart-shaped, about long and wide with a pimply upper surface. Flowering occurs from November to March.