rattlesnake fern: American fern whose clustered sporangia resemble a snake's rattle
grape fern: a fern of the genus Botrychium having a fertile frond bearing small grapelike clusters of spore cases
cycliophora: tiny marine organisms each the size of a period found in great numbers on lobsters' lips; identified tentatively in 1995 as a new phylum or as possible link between Entoprocta and Ectoprocta