Adiantum pedatum
Adiantum jordanii
adiante du Canada, five-fingered fern, northern maidenhair, northern maidenhair fern
adiantum, California maidenhair, California maidenhair fern
short-creeping;
scales bronzy deep yellow, concolored, margins entire.
short-creeping;
scales reddish brown, concolored, margins entire.
lax-arching (rarely pendent), closely spaced, 40–75 cm.
arching or pendent, clustered, 30–45 cm.
1–2 mm diam., glabrous, occasionally glaucous.
1–1.5 mm diam., glabrous, not glaucous.
fan-shaped, pseudopedate, 1-pinnate distally, 15–30 × 15–35 cm, glabrous;
proximal pinnae 3–9-pinnate;
rachis straight, glabrous, occasionally glaucous.
lanceolate, pinnate, 20–24 × 8–10 cm, gradually reduced distally, glabrous;
proximal pinnae 3(–4)-pinnate;
rachis straight, glabrous, not glaucous.
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.
fan-shaped, not quite as long as broad;
base truncate or broadly cuneate;
margins of fertile segments unlobed but very narrowly incised, sterile segments with margins lobed, denticulate;
apex rounded.
transversely oblong, 1–3 mm, glabrous.
transversely oblong, 3–10 mm, glabrous.
mostly 34–40 µm diam. 2n = 58.
mostly 40–50 µm diam. 2n = 60.
stalks 0.5–1.5(–1.7) mm, dark color entering into segment base.
stalks 1–4 mm, with dark color ending abruptly at segment base.
Adiantum pedatum
Adiantum jordanii
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.)
Adiantum jordanii occasionally hybridizes with A. aleuticum where their ranges overlap in northern California, yielding the sterile hybrid Adiantum × tracyi C. C. Hall ex W. H. Wagner. Adiantum × tracyi, morphologically intermediate between its parental species, can be distinguished from A. jordanii by its broadly deltate leaf blade that tapers abruptly from the 4(–5)-pinnate base to a 1-pinnate apex. It is best separated from A. aleuticum by leaf blades with a strong rachis, and by ultimate blade segments that are less than twice as long as broad. Adiantum × tracyi shows 59 univalents at metaphase; its spores are irregular and misshapen (W. H. Wagner Jr. 1962).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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