Thelypteris ovata |
Thelypteris patens |
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ovate maiden fern, ovate marsh fern |
grid-scale maiden fern |
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Stems | usually long-creeping, 3–6 mm diam. |
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Leaves | monomorphic, evergreen, (0.5–)1–4 cm apart, (30–)55–135(–165) cm. |
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Petiole | straw-colored, 15–80 cm × 2–6 mm, at base with tan to brownish, linear-lanceolate, hairy scales. |
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Blade | about equaling petiole length, broadest at base, gradually to somewhat abruptly tapered to pinnatifid apex. |
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Pinnae | (5–)10–25 × 0.8–2.2 cm, incised 4/5 of width; segments oblique, somewhat curved, basal pair from middle pinnae often elongate parallel to rachis; proximal pair of veins from adjacent segments reaching margin at or just above sinus. |
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Sori | round, supramedial to inframarginal; indusia tan, hairy, hairs mostly 0.2–0.4 mm; sporangia glabrous. |
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Indument | abaxially of hairs mostly 0.2–0.5 mm on costae, veins, and blade tissue, also sometimes of a few tan scales on costae and rachises; blades adaxially glabrous except along rachises and costae. |
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2n | = 72. |
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Thelypteris ovata |
Thelypteris patens |
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Distribution |
AL; FL; GA; SC; TX; Mexico; Central America; West Indies
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FL; s Mexico; Central America; West Indies in the Antilles; South America to s Brazil and n Argentina |
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Discussion | Varieties 2 (2 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 3 (1 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 2. | FNA vol. 2. | ||||
Parent taxa | Thelypteridaceae > Thelypteris > subg. Cyclosorus | Thelypteridaceae > Thelypteris > subg. Cyclosorus | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Christella ovata, Dryopteris ovata | Polypodium patens, Christella patens, Cyclosorus arcuatus, Dryopteris patens | ||||
Name authority | R. P. St. John: in Small, Ferns S. E. States 230, with plate. (1938) | (Swartz) Small: Ferns S. E. States 243. (1938) | ||||
Web links |