The spores are of two kinds, as in selaginella, but the macrosporangia contain numerous macrospores.
In the United Kingdom there is only one native species of selaginella.
Open 4-valved spore-case of a selaginella, and its four large spores (macrospores), magnified.
In the second genus, Miadesmia, the seed-bearing plant was herbaceous, and much like a recent selaginella.
Nearest to the water the primeval garden began with ferns and creeping selaginella.
To start away with, the selaginella bears two kinds of spores, each of which in its development has a definite sex character.