| gleichenia | (n) type genus of Gleicheniaceae: leptosporangiate ferns with sessile sporangia; South Africa to Malaysia and New Zealand, Syn. genus Gleichenia |
| gleicheniaceae | (n) a family of ferns belonging to order Filicales, Syn. family Gleicheniaceae |
| umbrella fern | (n) large Australasian fern with fanlike repeatedly forked fronds; sometimes placed in genus Gleichenia, Syn. fan fern, Sticherus flabellatus, Gleichenia flabellata |