Abstract
Stem erect to decumbent, massive, usually dichotomously branched, or with a single arborescent trunk, medullated protostelic, becoming dictyostelic, indurated, lacking indument; leaves usually ca. 1–2 m long, pinnate, bearing trichomes, at least when young, circinate in the bud, petiole with an expanded, stipular base; sporangia separate or in loose clusters, borne on wholly fertile parts of the lamina or on the abaxial surface of relatively unmodified segments, with a short, many-rowed stalk, and a poorly differentiated annulus; homosporous, spores with chlorophyll (green). Gametophyte epigeal, with chlorophyll, obcordate to elongate, with a thickened center and thin margins, the archegonia borne on the lower surface in rows along both sides of the thickened portion, the several- to many-celled antheridia mostly on the lower surface of the margins, less often at their edge.
Osmundaceae Bercht. & J. S. Presl, Přirozen. Rostl. 1: 272. 1820. Type: Osmunda L.
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Tryon, R.M., Tryon, A.F. (1982). Osmundaceae. In: Ferns and Allied Plants. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8162-4_4
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