Thelypteris interrupta |
Thelypteris ovata |
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Hottentot fern, spready tri-vein fern, Willdenow's fern, Willdenow's maiden fern |
ovate maiden fern, ovate marsh fern |
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Stems | long-creeping, cordlike, 3–6 mm diam. |
usually long-creeping, 3–6 mm diam. |
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Leaves | monomorphic, evergreen, 3–6 cm apart, 50–150(–250) cm. |
monomorphic, evergreen, (0.5–)1–4 cm apart, (30–)55–135(–165) cm. |
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Petiole | straw-colored to tan, 20–125 cm × 3–6 mm, scaleless. |
straw-colored, 15–80 cm × 2–6 mm, at base with tan to brownish, linear-lanceolate, hairy scales. |
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Blade | 30–125 cm, broadest at base, gradually narrowed distally to pinnatifid apex. |
about equaling petiole length, broadest at base, gradually to somewhat abruptly tapered to pinnatifid apex. |
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Pinnae | 7–30 × 1–2 cm, incised 1/3–1/2(–3/5) of width; segments deltate, rounded to acute; proximal pair of veins from adjacent segments united at acute or obtuse angle below sinus, with excurrent vein 2–4 mm. |
(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, medial to supramedial; indusia tan, glabrous to hairy; sporangia with red- or orange-capped, stalked, globose glands arising from sporangial stalks. |
round, supramedial to inframarginal; indusia tan, hairy, hairs mostly 0.2–0.4 mm; sporangia glabrous. |
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Indument | abaxially of hairs 0.1–0.3 mm on costae and veins, or hairs often lacking, costae also with tan, ovate scales; veins, costules, and costae adaxially glabrous or sparsely pubescent; blade tissue without hairs on both sides, or hairy abaxially, usually with red to orange, shiny, sessile, hemispheric glands abaxially. |
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 | = 144. |
= 72. |
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Thelypteris interrupta |
Thelypteris ovata |
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Habitat | Wet roadside ditches, riverbanks, marshes, and cypress swamps | |||||
Elevation | 0–50 m (0–200 ft) | |||||
Distribution |
FL; LA; Mexico; Central America; West Indies in the Antilles; South America to Argentina; tropical and subtropical Asia; Africa |
AL; FL; GA; SC; TX; Mexico; Central America; West Indies
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Discussion | D. B. Lellinger (1985) applied the name Thelypteris interrupta to specimens from India, while using T. totta (type from South Africa) for North American and South American specimens. Diploid cytotypes are known from Africa and Asia, whereas all counts from the Neotropics are tetraploid. Until more counts are available and the morphologic variation (chiefly in glands, pubescence, and leaf size) in this species complex is better understood, I prefer to circumscribe the species broadly. R. E. Holttum (1982) circumscribed Cyclosorus (as a genus) to include this species and one or two others. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Varieties 2 (2 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 | Pteris interrupta, Cyclosorus gongylodes, Cyclosorus interruptus, Cyclosorus tottus, Dryopteris gongylodes, T. gongylodes, T. totta | Christella ovata, Dryopteris ovata | ||||
Name authority | (Willdenow) K. Iwatsuki: Jap. J. Bot. 38: 314. (1963) | R. P. St. John: in Small, Ferns S. E. States 230, with plate. (1938) | ||||
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