Pour the following ingredients for potting soil into a large container: perlite, charcoal, humus, pumice, lava rock and peat moss. Filter the mixture through a coarse sieve to pull out the extra large pieces.
Add enough water to moisten the mixture, mixing the ingredients thoroughly to distribute the water evenly.
Pour the potting soil into a plant pot. Smooth over the surface of the soil, pressing it lightly.
Sprinkle the fresh Fosterella seeds over the surface of the potting soil. Spray them with a spray bottle set to a fine mist so that you moisten the surface of the seeds.
Place the pot in a plastic bag to keep a humid environment around the seeds. Keep the pot in bright light, to encourage germination. Set the temperature at 70 to 80 degrees, Fahrenheit.
Leave the plastic bag over the plant pot for at least two months, during which time the seeds will germinate and become seedlings.