Thelypteris interrupta (Willd.) K.Iwats.

Authority

Mickel, John T. & Smith, Alan R. 2004. The pteridophytes of Mexico. Mem. New York Bot. Gard. 88: 1-1054.

Family

Thelypteridaceae

Scientific Name

Thelypteris interrupta (Willd.) K.Iwats.

Description

Species Description - Rhizomes long-creeping, black, naked, 3–6 mm diam., stipe bases mostly 2–9 cm apart; fronds 50–150(–200) cm long; stipes 17–105 cm x 3–6 mm, glabrescent; blades chartaceous to subcoriaceous, 30–80 cm long, tapering evenly toward the pinnatifid apices; pinnae 7–30 x 1–2.2 cm, incised 0.3–0.6 the way to the costae, lowermost short-stalked 1–4 mm; segments deltate, rounded to acute at tips; veins 9–18 pairs per segment, proximal pair from adjacent segments united at an obtuse angle below the sinuses with an excurrent vein usually 2–4 mm long; indument abaxially of tan, ovate ciliate costal scales mostly 0.5–1.5 x 0.2– 0.8 mm, infrequently the costae also with sparse to moderately dense hairs 0.1–0.2 mm long, tissue between veins with red or orange, sessile, lustrous glands, adaxially the blades glabrous except for sparse costal hairs; sori medial to supramedial, often appearing confluent when sporangia mature, with glabrous or hairy indusia, sporangial stalks often bearing stalked glands like those on blades; 2n =72 (OW), 144 (Fla, Jam).

Discussion

Pteris interrupta Willd., Phytogr. 13, t. 10, f. 1. 1794. Cyclosorus interruptus (Willd.) H. Itoˆ, Bot. Mag. Tokyo 51: 714, f. g. 1937. Type. India. Klein s.n. (BWilld. 19770, 2 sheets).

Polypodium tottum Thunb., Prodr. Pl. Cap. 172. 1800. Thelypteris totta (Thunb.) Schelpe, J. S. African Bot. 29: 91. 1963. Cyclosorus tottus Thunb.) Pic. Serm., Webbia 23: 173. 1968. Type. South Africa. Thunberg Hb. 24724 (UPS!). Aspidium gongylodes Schkuhr, 24. Kl. Linn. Pfl.-Syst. 2: 193, t. 33c. 1805 [“goggilodus”]. Cyclosorus gongylodes (Schkuhr) Link, Hort. Berol. 2: 128. 1833.

Thelypteris gongylodes (Schkuhr) Small, Ferns S.E. States 248. 1938. Type. British Guiana. Essequebo, received by Ga¨rtner (isotypes S, B).

Nephrodium paludosum Liebm., Mexic. Bregn. 275 (reprint 133)]. 1849. Lectotype (chosen by Smith, 1971: 56). Mexico. Veracruz: Circa San Antonio Huatusco, Liebmann s.n. [Pl. Mex. 2658, Fl. Mex. 494] (C!, photos UC!, frag. US!).

Thelypteris interrupta is easily distinguished from other Mexican Cyclosorus by the presence of orangish or reddish glands on the blades abaxially, ovate costal scales, and very long-creeping, blackish, nearly naked rhizomes. Cyclosorus is treated by Holttum as a small genus of about two or three species, in Mexico including only T. interrupta. This species, T. serrata, and T. palustris, are also the only Thelypteris in Mexico that grow in swampy sites. Most specimens of T. interrupta from Mexico lack hairs on the rachises and costae abaxially; exceptions are Matuda 3338, from Tabasco, and Liebmann 492, 493, 494 (C) and Marti´nez C. 1615, from Veracruz.

Distribution

Marshes and swamps, wet ditches; 0–1700 m. USA (Fla); Mexico; Guat, Hond, Salv, CR, Pan; Gr & L Ant; Col, Ven, Guy, Sur, Fr Gui, Ec, Peru, Braz, Bol, Parag, n Arg, Uru; tropical and subtropical Africa, Asia.

Asia| Africa| Uruguay South America| Argentina South America| Paraguay South America| Bolivia South America| Brazil South America| Peru South America| Ecuador South America| French Guiana South America| Suriname South America| Guyana South America| Venezuela South America| West Indies| Panama Central America| Costa Rica South America| El Salvador Central America| Honduras Central America| Guatemala Central America| México Mexico North America| Florida United States of America North America|