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rosy maidenhair, rough maidenhair

Green Mountain maidenhair, Green Mountain maidenhair fern

Stems

short-creeping;

scales dark reddish brown, concolored, margins entire.

short-creeping;

scales bronzy deep yellow, concolored, margins entire.

Leaves

arching, clustered, 20–37 cm.

arching to stiffly erect, often densely clustered, 38–75(–90) cm.

Petiole

1–2 mm diam., adaxially hispid, not glaucous.

1–3 mm diam., glabrous, often glaucous.

Blade

lanceolate, pinnate or occasionally pseudopedate, 1-pinnate distally, 12–18 × 6.5–8 cm;

proximal pinnae 1–4-pinnate;

indument of light-colored, sparse, multicellular hairs;

rachis straight, densely hispid, not glaucous.

fan-shaped to funnel-shaped, pseudopedate, 1-pinnate distally, 10–35 × 10–35(–45) cm, glabrous;

proximal pinnae 2–7-pinnate;

rachis straight, glabrous, often glaucous.

Ultimate segments

oblong to long-triangular, ca. 2 times as long as broad, progressively reduced toward apex of penultimate divisions;

basiscopic margin oblique;

acroscopic margin of fertile segments crenulate, sterile segments sharply denticulate;

apex obtuse or acute.

long-triangular, ca. 2.5 times as long as broad;

basiscopic margin oblique;

acroscopic margin lobed, lobes separated by narrow (less than 1 mm) incisions;

apex acute, usually entire.

False indusia

± round, 0.6–0.9 mm diam., covered with reddish brown, stiff, needlelike bristles.

transversely oblong, mostly 2–5(–10) mm, glabrous.

Spores

mostly 40–60 µm diam.

mostly 45–58 µm diam. 2n = 116.

Segment

stalks 0.2–0.3 mm, dark color generally entering into segment base.

stalks (0.4–)0.6–1.5(–1.9) mm, dark color commonly entering into segment base.

Adiantum hispidulum

Adiantum viridimontanum

Phenology Sporulating summer–fall. Sporulating summer–fall.
Habitat Banks and old walls Restricted to serpentine sites where it occurs in rock clefts, on talus slopes, and in well-developed serpentine soils
Elevation 0–100 m [0–300 ft] 200–800 m [700–2600 ft]
Distribution
from FNA
CT; GA; Asia in s India; e Africa; Pacific Islands [Introduced in North America]
[BONAP county map]
from FNA
VT
[BONAP county map]
Discussion

Adiantum hispidulum is represented by sporadic escapes from cultivation in the flora, possibly naturalized locally. It also has been reported from Florida and Louisiana.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Adiantum viridimontanum, an allopolyploid from a sterile hybrid between A. pedatum and A. aleuticum, is known only from north central Vermont (C. A. Paris and M. D. Windham 1988). Additional populations may eventually be located on serpentine in southern Quebec.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 2. Treatment author: Cathy A. Paris. FNA vol. 2. Treatment author: Cathy A. Paris.
Parent taxa Pteridaceae > Adiantum Pteridaceae > Adiantum
Sibling taxa
A. aleuticum, A. capillus-veneris, A. jordanii, A. melanoleucum, A. pedatum, A. tenerum, A. tricholepis, A. viridimontanum
A. aleuticum, A. capillus-veneris, A. hispidulum, A. jordanii, A. melanoleucum, A. pedatum, A. tenerum, A. tricholepis
Name authority Swartz: J. Bot. (Schrader) 1800(2): 82. (1801) Paris: Rhodora 93: 108. (1991)
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