Figures 24–26 in Cell structure and microtubule organisation during gametogenesis of Ulva mutabilis Føyn (Chlorophyta)

Figures 24–26: Advanced stages of gametangia formation of Ulva mUtabilis (before gamete release). (24) Cross-section of fully developed gametangium. Cell wall in conical projection appears broken and opening is plugged by cap of cell wall material. Scale bar: 2.8 µm. (25) Detail of cap. Cell wall appears differentiated with loose fibrillar layers embedded in amorphous matrix. Scale bar: 0.69 µm. (26) Exit pore of gametangium. Cap is not visible, but darkly stained amorphous material appears gathered in pore and below (arrow). Vesicles are observed among the gametes. Scale bar: 1.2 µm.