Floral Nectary Anatomy and Ultrastructure in Mycoheterotrophic Plant, Epipogium aphyllum Sw. (Orchidaceae)

Figure 5

Lip spur, 4th day of anthesis: (a) surface of adaxial (inner) part of spur with places of secretion (yellow) (SEM). (b) Secretion in the apex of the spur (SEM). (c) Cross-section of spur, the apex of the spur with secretion (TBO). (d) Magnification of (c), secretion (TBO). (e) Further part of spur with visible secretion, large nuclei in dense cytoplasm (TBO). (f) Cross-section of the middle part of spur, the places with exudation (arrows) (TBO). (g) Large amount of the secretion inside spur, stained for proteins (ABB) (se: secretion).