Figure 10. Male gamete in Pseudostaurosira trainorii, showing the morphology in the amoeboid phase.

SEM. Scales  =  2 µm. A. A thread is extruded from the pseudopodium-like structure. B. Short projections are visible on the edge of the pseudopodium-like structure. C. Highly elongated cell extending pseudopodia at both ends. D. Male gamete attaching to a female gametangium by its thread. Arrow and arrowhead indicate thread and finer projections, respectively.