Thelypteris augescens

(Link) Munz & I. M. Johnston

Amer. Fern J. 12: 75. 1922.

Common names: Abrupt-tipped maiden fern
Illustrated
Basionym: Aspidium augescens Link Fil. Spec., 103. 1841
Synonyms: Christella augescens (Link) Pichi-Sermolli Dryopteris augescens (Link) C. Christensen
Treatment appears in FNA Volume 2.

Stems creeping, 4–8 mm diam. Leaves monomorphic, evergreen, (0.5–) 1–3.5 cm apart, (30–) 65–140 cm. Petiole straw-colored, 15–70 cm × 2–7 (–9) mm, at base with scales tan to brownish, linear-lanceolate, hairy at margin. Blade 30–70 cm, broadest at or near base, abruptly narrowed distally, apical pinna ± similar to lateral pinnae, 5–17 × 1–3 (–5) cm. Pinnae (4–) 10–22 (–28) × (0.3–) 0.7–1.5 cm, incised 1/2–3/4 of width; segments somewhat curved, margins revolute, those at base of proximal pinnae slightly elongate; proximal pair of veins from adjacent segments running to sinus. Indument abaxially of hairs 0.2–0.4 mm on costae, veins, and blade tissue, also of brownish scales 0.6–1.2 mm on costae; veins and blade tissue glabrous adaxially. Sori round, medial to supramedial; indusia tan, bearing hairs 0.2–0.4 mm; sporangia glabrous. 2n = 144.


Habitat: Limestone banks, in sun or partial shade
Elevation: 0–50 m

Distribution

V2 125-distribution-map.gif

Fla., s Mexico, West Indies in the Bahamas, Cuba, Central America in Guatemala

Discussion

Thelypteris augescens occasionally hybridizes with T. kunthii and T. ovata var. ovata in southern Florida.

Selected References

None.

Lower Taxa

None.

"broadest" is not a number."/2" is not declared as a valid unit of measurement for this property.

... more about "Thelypteris augescens"
reduced +
3 cm30 mm <br />0.03 m <br /> (5 cm50 mm <br />0.05 m <br />) +
5 cm50 mm <br />0.05 m <br /> (17 cm170 mm <br />0.17 m <br />) +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
Alan R. Smith +
(Link) Munz & I. M. Johnston +
elongate +
Aspidium augescens +
narrowed +
30 cm300 mm <br />0.3 m <br /> (70 cm700 mm <br />0.7 m <br />) +
Abrupt-tipped maiden fern +
Fla. +, s Mexico +, West Indies in the Bahamas +, Cuba +  and Central America in Guatemala +
0–50 m +
glandular +  and hairy +
not continuous +
Limestone banks, in sun or partial shade +
branched +  and simple +
transparent +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
ephemeral +  and persistent +
round-reniform +
small +  and large +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.04 cm0.4 mm <br />4.0e-4 m <br />) +
monomorphic +
30 cm300 mm <br />0.3 m <br /> (65 cm650 mm <br />0.65 m <br />) +
evergreen +
65 cm650 mm <br />0.65 m <br /> (140 cm1,400 mm <br />1.4 m <br />) +
reticulate +  and echinate +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
straw-colored +
15 cm150 mm <br />0.15 m <br /> (70 cm700 mm <br />0.7 m <br />) +
linear-lanceolate +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
short-stalked +  and sessile +
22 cm220 mm <br />0.22 m <br /> (28 cm280 mm <br />0.28 m <br />) +
0.3 cm3 mm <br />0.003 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
10 cm100 mm <br />0.1 m <br /> (22 cm220 mm <br />0.22 m <br />) +
not +  and reduced +
Amer. Fern J. +
brownish +  and tan +
Illustrated +
hairy +  and glabrous +
0.15 cm1.5 mm <br />0.0015 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
long-creeping;ascending +
Christella augescens +  and Dryopteris augescens +
Thelypteris augescens +
Thelypteris subg. Cyclosorus +
species +
crescent--shaped +
simple +  and anastomosing +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
on rock +  and terrestrial +