| matteuccia | (n) small genus sometimes included in genus Onoclea; in some classifications both genera are placed in Polypodiaceae, Syn. genus Matteuccia, genus Pteretis, Pteretis |
| ostrich fern | (n) tall fern of northern temperate regions having graceful arched fronds and sporophylls resembling ostrich plumes, Syn. fiddlehead, Pteretis struthiopteris, shuttlecock fern, Onoclea struthiopteris, Matteuccia struthiopteris |