Fig. 4

Floral ontogeny of Phalaenopsis equestris. a Undifferentiated oval-shaped early stage primordia covered by bracts, ×50 magnitude; b The transversally stretched bulges of early floral development with the initiation of sepals, ×350 magnitude; c–e further differentiation and development of sepals, petals and labellum of a single flower, ×200–×150 magnification; e–f an almost fully developed labellum and initiation of anther, ×150–×130 magnification; g further differentiation of median carpel, anther and staminodes, ×100 magnitude; h almost full-grown gynostemium, ×70 magnification; i halfway developed callus on the labellum, ×45 magnification. Scale bar: 100 µm. *F primordial floral bud; A1 anther, a1–a2 staminodes, Br bracts, Ca callus, Gm gynostemium, L labellum, mC median carpel, P1–P2 abaxial petals, S1–S2 abaxial sepals, S3 median sepal, St stelidia. Scale bar: 100 µm. Photographs by Dewi Pramanik