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C–F, development of the spore fruit, × 300. ar. archicarp.

The antheridium undergoes no further change, but the archicarp soon divides into two cells,—a small basal one and a larger upper cell.

Shortly before the fruit is ripe, the upper cell of the archicarp, which has increased many times in size, shows a division of its contents into eight parts, each of which develops a wall and becomes an oval spore.

It is more slender than the archicarp, but otherwise differs little from it.

There next grow from the inner surface of the covering cells, short filaments, that almost completely fill the space between the archicarp and the wall.