Thelypteris kunthii |
Thelypteris hispidula |
|
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Kunth's maiden fern, southern shield fern, widespread maiden fern |
hairy maiden fern, roughhairy maiden fern |
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Stems | short- to long-creeping, 4–8 mm diam. |
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Leaves | monomorphic, evergreen, up to 2(–3) cm apart, (15–)50–160 cm. |
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Petiole | straw-colored, (5–)20–80 × (1–)3–6 mm, at base with brown, linear-lanceolate, hairy scales. |
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Blade | (9–)30–80 cm, broadest at base, gradually tapered to pinnatifid apex. |
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Pinnae | (2–)8–15(–20) × (0.6–)1–2.5 cm, incised 3/5–4/5 of width; segments oblong, rounded to acute at apex; proximal pair of veins from adjacent segments running to sinus, or nearly so. |
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Sori | round, medial to supramedial; indusia tan, hairy, hairs 0.2–0.4 mm; sporangial glands obscure, yellowish, stalked, arising from sporangial stalks. |
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Indument | abaxially of hairs mostly 0.3–1 mm on costae, veins, and blade tissue; veins adaxially with similar hairs but blade tissue usually without hairs, often with scattered yellowish, stalked glands 0.1 mm. |
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2n | = 144. |
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Thelypteris kunthii |
Thelypteris hispidula |
|
Habitat | Roadsides, ditches, riverbanks, woodlands, limestone sinks | |
Elevation | 0–100 m (0–300 ft) | |
Distribution |
AL; AR; FL; GA; LA; MS; SC; TX; e,s Mexico; West Indies; Bermuda; Central America to Costa Rica; South America from Colombia to n Brazil
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AL; FL; GA; LA; MS; SC; TX; North America; Mexico; Central America; South America; tropical and subtropical; West Indies in the Antilles; Asia; Africa
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Discussion | Thelypteris kunthii occasionally hybridizes with T. augescens and T. ovata in Florida; hybrids with T. hispidula may also occur. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 4 (1 in the flora). This species and the next are included in Christella subg. Christella by R. E. Holttum (1982). The relationship between Old World and New World varieties is unstudied. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 2. | FNA vol. 2. |
Parent taxa | Thelypteridaceae > Thelypteris > subg. Cyclosorus | Thelypteridaceae > Thelypteris > subg. Cyclosorus |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Nephrodium kunthii, Christella normalis, Dryopteris normalis, T. macrorhizoma, T. normalis, T. saxatilis, T. unca | Aspidium hispidulum, Christella hispidula, Cyclosorus quadrangularis, Dryopteris hispidula, Dryopteris quadrangularis, T. quadrangularis |
Name authority | (Desvaux) C. V. Morton: Contr. U.S. Natl. Herb. 38: 53. (1967) | (Decaisne) C. F. Reed: Phytologia 17: 283. (1968) |
Web links |