Fig. 2From: Floral attractants in the black orchid Brasiliorchis schunkeana (Orchidaceae, Maxillariinae): clues for presumed sapromyophily and potential antimicrobial activityThe transverse sections of the lip (TBO, light microscope) show a single layer of the epidermis and few collateral vascular bundles in the parenchyma. a lip base with flat callus. b epidermis, magnification of a. c lip—further part. d-e lip—beginning of raising callus. f rectangular shape of callus. g-h lip apex with papillae. Arrows indicate idioblasts with raphides. ab—abaxial (outer) surface, ad—adaxial (inner) surface, ca—callus, ie—inner epidermis, n—nucleus, pa—parenchyma, vb—vascular bundleBack to article page