Osmundales

plant order

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In fern: Annotated classification
(leptosporangiate ferns) Order Osmundales Family Osmundaceae (royal ferns) Plants in soil, often in wetlands; rhizomes often stout, usually erect or ascending, occasionally trunklike; leaves 1 to 4 times pinnately divided; the petiole thickened at the base; sporangia often on contracted, sometimes nongreen segments of entirely separate fertile
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