Thelypteris interrupta (Willd.) K.Iwats.

  • Authority

    Mickel, John T. & Beitel, Joseph M. 1988. Pteridophyte Flora of Oaxaca, Mexico. Mem. New York Bot. Gard. 46: 1-580.

  • Family

    Thelypteridaceae

  • Scientific Name

    Thelypteris interrupta (Willd.) K.Iwats.

  • Description

    Species Description - Rhizome long-creeping, black, naked, 3-6 mm diam., stipe bases mostly 2-9 cm apart; stipe 17-105 cm long, 3-6 mm diam., glabrescent; lamina chartaceous to subcoriaceous, 30-80 cm long, tapering evenly toward the pinnatifid apex; largest pinnae 7-30 cm long, 1.0-2.2 cm wide, incised 0.3-0.6 their width, lowermost short-stalked 1-4 mm; segments deltate, rounded to acute at tip; veins 9-18 pairs per segment, basal pair from adjacent segments obtusely united below sinus with an excurrent vein usually 2-4 mm long; scales on costae below; costae, veins, and leaf tissue glabrous or pubescent below, hairs 0.1-0.2 mm long, glabrous above except for sparse costal hairs; glands often present on lamina below, these red or orange, sessile, shining; sori often appearing confluent when sporangia mature; sporangial stalks often bearing stalked glands like those on lamina; indusia glabrous or hairy; n = 36, 72.

  • Discussion

    Pteris interrupta Willdenow, Phytogr. 13, t. 10, f. 1. 1794. Type. India. Klein s.n. (B-Willd. 19770, 2 sheets). Polypodium tottum Thunberg, Prodr. pl. cap. 172.1800. Thelypteris totta (Thunberg) Schelpe, J. S. African Bot. 29: 91. 1963. Cyclosorus tottus (Thunberg) Pichi Sermolli, Webbia 23: 173. 1968. Type. South Africa. Thunberg Herb. 24724 (UPS!). Aspidium gongylodes Schkuhr (as “goggilodus”), 24. Kl. Linn. Pfl.-Syst. 1: 193, t. 33c. 1809. Cyclosorus gongylodes (Schkuhr) Link, Hort. berol. 2:128. 1833. Thelypteris gongylodes (Schkuhr) Small, Ferns s.e. States 248. 1938. Type. British Guiana. Essequibo, received by Gartner (isotypes S, B). Nephrodium paludosum Liebmann, Mexic. bregn. 275 (seors. 133). 1849. Lectotype (chosen by A. R. Smith, 1971: 56). Mexico. Veracruz: Ca. San Antonio Huatusco, Liebmann [PI. Mex. 2658, FI. Mex. 494] (C!, photos UC!, frag. US!). Thelypteris interrupta is easily distinguished from other Oaxacan Cyclosorus by the presence of orangish or reddish glands on the lamina below, ovate costal scales, and long-creeping, blackish rhizome. It is the type of Cyclosorus, which is treated by Holttum as a small genus of about three species. This species and T. serrata are the only Thelypteris in southern Mexico that grow in swampy sites.

  • Distribution

    Marshes and swamps, thus far not known from Oaxaca but to be expected; 8001700 m in Chis. Mexico (Nay, Hgo, Ver, Tab, Chis); US (Fla); Guat to Pan; WI; Ven & Gui to Parag, Uru, Arg; Old World tropics & subtropics.

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