Fig. 6. A and B, Labellar surface of M. rufescens showing small, peripheral, obpyriform papillae and larger, central obpyriform to clavate papillae with distended apices. C, Papillose, multiseriate trichomes of M. camaridii that may function as pseudostamens. D, Labellar papillae of M. johniana with associated pseudopollen. Scale bars = 500 µm (A) and 100 µm (B–D).