Adiantum tricholepis

Fée

8: 72. 1857.

Common names: Hairy maidenhair
Treatment appears in FNA Volume 2.

Stems short-creeping to nearly erect; scales dark reddish-brown, concolored, margins entire or minutely denticulate. Leaves arching or pendent, densely clustered, 20–62 cm. Petiole 0.8–1 mm diam., glabrous, occasionally glaucous. Blade ovate, pinnate, 15–38 × 8–26 cm, gradually reduced distally, hirsute; proximal pinnae 3–4-pinnate; rachis straight or becoming flexuous, glabrous, not glaucous. Segment stalks 1–4 mm, dark color ending ± abruptly at segment base. Ultimate segments transversely oblong, nearly round, or fan-shaped, about as long as broad; base truncate or cuneate; margins of fertile segments crenulate or entire, sterile segments with margins serrulate; apex rounded. Indusia transversely oblong or crescent-shaped, 0.5–4 mm, covered with whitish needlelike trichomes. Spores mostly 35–53 µm diam.


Phenology: Sporulating late winter–early spring.
Habitat: Moist, shaded, limestone cliffs along streams and rivers, on boulders in creeks, and among rocks on steep slopes
Elevation: 200–500 m

Distribution

V2 52-distribution-map.gif

Tex., Mexico, Central America in Guatemala, Belize

Discussion

Adiantum tricholepis occurs in the flora only in Bandera and Medina counties on the Edwards Plateau in central Texas. Collections identified as A. tricholepis from the mouth of the Pecos River are Adiantum capillus-veneris.

Selected References

None.

Lower Taxa

None.

"broad" is not a number.

... more about "Adiantum tricholepis"
Cathy A. Paris +
cuneate +  and truncate +
15 cm150 mm <br />0.15 m <br /> (38 cm380 mm <br />0.38 m <br />) +
reduced +
8cm;26cm +
Hairy maidenhair +
Tex. +, Mexico +, Central America in Guatemala +  and Belize +
200–500 m +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
yellow +  and white +
obcordate;reniform +
Moist, shaded, limestone cliffs along streams and rivers, on boulders in creeks, and among rocks on steep slopes +
crescent--shaped +  and oblong +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
monomorphic +
densely clustered;closely spaced +
recurved +  and reflexed +
noncircinate +  and circinate +
20 cm200 mm <br />0.2 m <br /> (62 cm620 mm <br />0.62 m <br />) +
dentate +, erose-ciliate +  and entire +
denticulate +  and entire +
chestnut-brown;dark purple or blackish +
glaucous +  and glabrous +
Sporulating late winter–early spring. +
flexuous +  and straight +
not glaucous +  and glabrous +
concolored;dark reddish-brown +
persistent +
linear-lanceolate +  and lanceolate +
entire +  and crenulate +
sterile +  and fertile +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
yellowish-brown +  and yellow +
1 +, 32 +  and 64 +
tetrahedral-globose +
short-creeping +  and nearly erect +
shiny +  and dull +
Adiantum tricholepis +
Adiantum +
species +
1 +  and several +
crescent--shaped +  and roundish +
anastomosing +  and simple +
conspicuous +
on rock +  and terrestrial +