Asterisk indicates a young spore with recently formed ornaments. ER, glycogen particles, the cell membrane and cell wall are distinctly visible. Two dome-shaped ornaments with a different electron density are rising from the outer border of the cell wall. Note the presence of long fibrillary structures in relation to the surface of the wall. Scale bar, 0.5 m .
Small arrows indicate the ornaments at the very beginning of development.
Scale bar, 0.5 m . Septal region between the basal and the terminal cell. In this higher magnification, small globules are noticeable at the bottom of these apical cavities. Note the slit-like spaces around the base of the ornaments. Compare these with Fig. 4 .