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Fig. 10 | EvoDevo

Fig. 10

From: Evolution and development of three highly specialized floral structures of bee-pollinated Phalaenopsis species

Fig. 10

Reconstruction of vascular bundle patterns in a mature flower of P. equestris based on μCT scanning. Figures a-h shown in sequence from base to apex. a Section through the base of the ovary, showing six vascular bundles indicated in purple; b base of receptacle, also showing the vascular bundle in the base of the labellum (L) derived from staminode (Sm) a3 that is feeding the callus and the vascular bundles feeding the lateral sepals (Ls); c position where one of the two lateral sepals (Ls) is connecting to the base of the labellum (L); d position where the dorsal sepal (Ds), lateral petals (Lp), and labellum (L) connect, showing the first visible staminodal vascular bundle (St/A2); e position showing more staminodal (St/A2-A3) vascular bundles, and red vascular bundles feeding the lateral petals (Lp) and labellum (L); f position showing the first visible vascular bundles of the fertile stamen (Fs/A1) and four staminodal vascular bundles feeding the stelidia (St/a1-A3 and St/a2-A2); it also shows the first development of the callus (Ca); g transversal position of gynostemium showing the vascular bundle running to the fertile stamen (St/A1), and four vascular bundles running to the stelidia (St/a1-A3 and St/a2-A2); h position of the labellum with callus (Ca) showing it is supported by a staminodal vascular bundle (Sm/a3). Ds dorsal sepal, Ls lateral sepal, Lp lateral petal, L labellum, Me mentum, Ca callus, Fs fertile stamen, Ss sterile stamen, St stelidia, A1–A3 staminodes in outer floral whorl, a1–a3 staminodes in inner floral whorl. Color codes: green = vascular bundles in sepals; red = vascular bundles in petals; yellow = vascular bundles in androecium; purple = vascular bundles in gynoecium. Scale bars: a = 0.5 mm; (bh) = 100 μm

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