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nounconstituting the order Marattiales: chiefly tropical eusporangiate ferns with gigantic fronds
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Definition that contains marattiaceae
- marattia type genus of the Marattiaceae: ferns having the sporangia fused together in two rows
- marattiales lower ferns coextensive with the family Marattiaceae
- order marattiales lower ferns coextensive with the family Marattiaceae
- genus marattia type genus of the Marattiaceae: ferns having the sporangia fused together in two rows
- tree fern any of numerous usually tropical ferns having a thick woody stem or caudex and a crown of large fronds; found especially in Australia and New Zealand; chiefly of the families Cyatheaceae and Marattiaceae but some from Polypodiaceae