Thelypteris interrupta

(Willdenow) K. Iwatsuki

Jap. J. Bot. 38: 314. 1963.

Common names: Hottentot fern Willdenow's fern spready tri-vein fern
Illustrated
Basionym: Pteris interrupta Willdenow Phytographia, 13. 1794
Synonyms: Cyclosorus gongylodes (Schkuhr) Link Cyclosorus interruptus (Willdenow) H. Itô Cyclosorus tottus (Thunberg) Pichi-Sermolli Dryopteris gongylodes (Schkuhr) Kuntze Thelypteris gongylodes (Schkuhr) Small Thelypteris totta (Thunberg) Schelpe
Treatment appears in FNA Volume 2.

Stems long-creeping, cordlike, 3–6 mm diam. Leaves monomorphic, evergreen, 3–6 cm apart, 50–150 (–250) cm. Petiole straw-colored to tan, 20–125 cm × 3–6 mm, scaleless. Blade 30–125 cm, broadest at base, gradually narrowed distally to pinnatifid apex. 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. 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. Sori round, medial to supramedial; indusia tan, glabrous to hairy; sporangia with red or orange-capped, stalked, globose glands arising from sporangial stalks. 2n = 144.


Habitat: Wet roadside ditches, riverbanks, marshes, and cypress swamps
Elevation: 0–50 m

Distribution

V2 815-distribution-map.gif

Fla., La., Mexico, West Indies in the Antilles, Central America, South America to Argentina, tropical and subtropical Asia, Africa

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.

Selected References

None.

Lower Taxa

None.

"/3" is not declared as a valid unit of measurement for this property.

... more about "Thelypteris interrupta"
Obtuse (?) +  and Acute (?) +
reduced +
Alan R. Smith +
(Willdenow) K. Iwatsuki +
Pteris interrupta +
narrowed +
30 cm300 mm <br />0.3 m <br /> (125 cm1,250 mm <br />1.25 m <br />) +
broadest +
Hottentot fern +, Willdenow's fern +  and spready tri-vein fern +
pubescent +  and glabrous +
Fla. +, La. +, Mexico +, West Indies in the Antilles +, Central America +, South America to Argentina +, tropical and subtropical Asia +  and Africa +
0–50 m +
glandular +  and hairy +
stalked;orange-capped;sessile +
red +  and orange +
globose +  and hemispheric +
not continuous +
Wet roadside ditches, riverbanks, marshes, and cypress swamps +
branched +  and simple +
transparent +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
ephemeral +  and persistent +
glabrous +  and hairy +
round-reniform +
small +  and large +
monomorphic +
150 cm1,500 mm <br />1.5 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
evergreen +
50 cm500 mm <br />0.5 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +
reticulate +  and echinate +
straw-colored +  and tan +
20cm;125cm +
short-stalked +  and sessile +
7 cm70 mm <br />0.07 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not +  and reduced +
Jap. J. Bot. +
Rounded (?) +  and Acute (?) +
Illustrated +
hairy +  and glabrous +
0.15 cm1.5 mm <br />0.0015 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
long-creeping;ascending +
cordlike +
Cyclosorus gongylodes +, Cyclosorus interruptus +, Cyclosorus tottus +, Dryopteris gongylodes +, Thelypteris gongylodes +  and Thelypteris totta +
Thelypteris interrupta +
Thelypteris subg. Cyclosorus +
species +
crescent--shaped +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
on rock +  and terrestrial +