Nephrolepis undulata (Afzel. ex Sw.) J.Sm.

  • Authority

    Proctor, George R. 1989. Ferns of Puerto Rico and the Virgin Islands. Mem. New York Bot. Gard. 53: 1-389.

  • Family

    Nephrolepidaceae

  • Scientific Name

    Nephrolepis undulata (Afzel. ex Sw.) J.Sm.

  • Description

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    Species Description - Rhizome very small and short-lived, less than 1 cm long and ca. 2 mm thick, associated with an ellipsoid or ovoid minutely scaly subterranean perennial tuber 1-2 cm long and 0.5 cm diam, at apex bearing a small tuft of lax, pale brown, lance-attenuate scales 1.5-2 mm long, and producing one or sometimes two fronds. Fronds laxly spreading, 20-50(-70) cm long, with very short stipes (2-6 cm); stipes pale brownish, naked, glabrous. Blades linear or lance-linear, 3-5.5 cm broad, acutish at apex, slightly narrowed toward base; rhachis pale brownish, naked; pinnae numerous, spreading, close or subimbricate, deltate to oblong-deltate, 1.5-3 cm long, acute at apex, inequilateral and cordate at base, the rounded acroscopic auricle overlying the rhachis, the margins rather coarsely crenate; veins oblique, 1- or 2-forked. Sori supramedial, relatively large; indusium semicircular to lunate-reniform, broadly attached, opening toward apex of pinna, membranous, translucent, and persistent.

  • Discussion

    Basionym. Aspidium undulatum Afzelius ex Swartz, J. Bot. (Schrader) 1800(2): 32. 1802.

    Type. Afzelius, s.n., from Sierra Leone, Africa (BM, not seen).

    Syn. Nephrolepis occidentalis Kunze, Linnaea 18: 343. 1844. (Type. Leibold, s.n., from Mexico, LZ, destroyed.)

    Nephrolepis cordifolia var. occidentalis (Kunze) Kuhn ex Krug, Bot. Jahrb. Syst. 24: 121. 1897.

    Nephrolepis pectinata var. occidentalis (Kunze) Urban, Symb. antill. 9: 316. 1925.

  • Distribution

    General Distribution. Hispaniola, Puerto Rico Central America from Mexico to Costa Rica, and tropical Africa.

    Haiti South America| Dominican Republic South America| Puerto Rico South America| Central America| Mexico North America| Guatemala Central America| Belize Central America| El Salvador Central America| Honduras Central America| Nicaragua Central America| Costa Rica South America| Africa|