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Northern holly fern

Stems

erect.

Leaves

to 50 cm but usually smaller, 10 cm or even shorter in specimens from exposed sites; bulbils absent.

Petiole

short; less than 20% of the leaf length;

leaves sometimes subsessile; chaffy scales sparse to dense on the petiole and rachis.

Blades

1-pinnate; very narrow; more or less linear; to approximately 45 × 5 cm; widest in the mid-region and tapered to apex and base;

microscales narrow on abaxial surface;

adaxial surface glabrous.

Pinnae

oblonglanceolate, slightly falcate; up to 4 × 1.5 cm; lowest pinnae often broadly triangular, rarely overlapping; in 1 plane;

margins regularly spiny-toothed;

spines conspicuous, spreading or angled forward, acroscopic auricle large, broadly triangular; ovate, bearing several spreading spines.

Sori

with irregularly toothed indusia.

2n

=82.

Polystichum lonchitis

Polystichum setigerum

Distribution
[WildflowerSearch map]
[BONAP county map]
[BONAP county map]
Discussion

Shaded, rocky or occasionally wet places. 300–3000 m. BR, BW, Casc, ECas, Sisk. CA, ID, NV, WA; north to AK, circumboreal. Native.

Source Flora of Oregon, volume 1, page 76
Duncan Thomas
Sibling taxa
P. andersonii, P. andersonii x Polystichum munitum, P. californicum, P. californicum x Polystichum munitum, P. imbricans, P. kruckebergii, P. lemmonii, P. munitum, P. scopulinum
P. andersonii, P. andersonii x Polystichum munitum, P. californicum, P. californicum x Polystichum munitum, P. imbricans, P. kruckebergii, P. lemmonii, P. lonchitis, P. munitum, P. scopulinum
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