Fig. 1.

Macro and micromorphological features of flowers of Bulbophyllum echinolabium. a Flower. b, c Details of the flower. d The adaxial (inner) surface of the hypochile composed by prickles. e Detail of d, the prickle. f, g Fragmented cuticle on the adaxial surface of the epidermis: apical (f) and basal (g) part of prickle. h Smooth cells on the abaxial (outer) surface of the epichile. i Inner (adaxial) smooth surface of the stelidia. j Detail of the appendage of the stelidium with elongated cells. a anther-cap, an appendage of stelidium, ds dorsal sepal, e epichile, g gynostemium, gr groove (marked with white on b), h hypochile, k keel (marked with yellow on b), ls lateral sepal, pr prickle, pt petal, st stelidium