The Collaborative International Dictionary of English v.0.48:

Selaginella \Sel`a*gi*nel"la\, n. [NL., fr. L. selago, -inis, a
   kind of plant.] (Bot.)
   A genus of cryptogamous plants resembling Lycopodia, but
   producing two kinds of spores; also, any plant of this genus.
   Many species are cultivated in conservatories.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Selaginella
    n 1: type and sole genus of the Selaginellaceae; evergreen moss-
         like plants: spike moss and little club moss [syn:
         Selaginella, genus Selaginella]