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adiante du Canada, five-fingered fern, northern maidenhair, northern maidenhair fern

fragrant maidenhair

Stems

short-creeping;

scales bronzy deep yellow, concolored, margins entire.

short-creeping;

scales dark reddish brown, concolored, margins entire.

Leaves

lax-arching (rarely pendent), closely spaced, 40–75 cm.

arching to erect, clustered, (15–)35–80 cm.

Petiole

1–2 mm diam., glabrous, occasionally glaucous.

1–2 mm diam., minutely rough, abaxially strigose, not glaucous.

Blade

fan-shaped, pseudopedate, 1-pinnate distally, 15–30 × 15–35 cm, glabrous;

proximal pinnae 3–9-pinnate;

rachis straight, glabrous, occasionally glaucous.

ovate, pinnate, 1-pinnate distally (small leaves 1-pinnate throughout), (11–)15–35 × (3.5–)8–15 cm, glabrous;

proximal pinnae (and sometimes also next 2–3 pairs) 1–2(–3)-pinnate;

rachis straight, densely minutely rough.

Ultimate segments

oblong, ca. 3 times as long as broad;

basiscopic margin straight;

acroscopic margin lobed, lobes separated by narrow incisions 0–0.9(–1.1) mm wide;

apex obtuse, divided into shallow, rounded lobes separated by shallow sinuses 0.1–2(–3.7) mm deep, margins of lobes crenulate or crenate-denticulate.

oblong, about 2 times as long as broad;

basiscopic margin straight or sometimes oblique;

acroscopic margin shallowly lobed, lobes separated by narrow incisions;

apex obtuse, shallowly lobed.

Indusia

transversely oblong, 1–3 mm, glabrous.

False indusia

crescent-shaped, 1–4.5 mm, glabrous.

Spores

mostly 34–40 µm diam. 2n = 58.

mostly 40–50 µm diam. 2n = 60.

Segment

stalks 0.5–1.5(–1.7) mm, dark color entering into segment base.

stalks 0.1–0.8 mm, dark color entering into segment base.

Adiantum pedatum

Adiantum melanoleucum

Phenology Sporulating summer–fall. Sporulating throughout the year.
Habitat Rich, deciduous woodlands, often on humus-covered talus slopes and moist lime soils Hammocks and limestone sinks in Everglades National Park
Elevation 0–700 m (0–2300 ft) 0 m (0 ft)
Distribution
from FNA
AL; AR; CT; DC; DE; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; TN; VA; VT; WI; WV; NB; NS; ON; QC
[WildflowerSearch map]
[BONAP county map]
from FNA
FL; West Indies in Greater Antilles; Bahamas
[BONAP county map]
Discussion

Once considered a single species across its range in North America and eastern Asia, Adiantum pedatum is considered to be a complex of at least three vicariant species (A. pedatum and A. aleuticum occur in North America) and a derivative allopolyploid species (C. A. Paris 1991). Adiantum pedatum in the strict sense is restricted to deciduous woodlands in eastern North America.

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

Source FNA vol. 2. FNA vol. 2.
Parent taxa Pteridaceae > Adiantum Pteridaceae > Adiantum
Sibling taxa
A. aleuticum, A. capillus-veneris, A. hispidulum, A. jordanii, A. melanoleucum, A. tenerum, A. tricholepis, A. viridimontanum
A. aleuticum, A. capillus-veneris, A. hispidulum, A. jordanii, A. pedatum, A. tenerum, A. tricholepis, A. viridimontanum
Synonyms A. pedatum, A. pedatum
Name authority Linnaeus: Sp. Pl. 2: 1095. (1753) Willdenow: Sp. Pl. 5(1): 443. (1810)
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