Pteridium aquilinum var. pubescens

L. Underwood

Native Ferns ed. 6 91. 1900.

Common names: Western bracken
Basionym: Pteris aquilina var. pubescens (L. Underwood) Clute Fern Bull. 8: 37. 1900
Treatment appears in FNA Volume 2. Mentioned on page 203.

Petiole 10–100 cm. Blade ovate-triangular to nearly pentagonal, 3-pinnate to 3-pinnate-pinnatifid, 30–200 × 15–100 cm; blades, rachises, and costae usually densely covered abaxially with abundant, contorted, lax, spreading hairs. Pinnae (proximal) triangular, distal pinnae oblong; terminal segment of each pinna ca. 4 times longer than wide, longer ultimate segments less than their width apart, ca. 1.5–5 mm wide. Pinnules at nearly 90° angle to costa; fertile ultimate segments adnate or equally decurrent and surcurrent. Outer indusia entire, pilose on margin and surface, hairs like those of axes.


Habitat: In dry to moist woods and open areas in partial to full sun, forming abundant colonies
Elevation: 0–3000 m

Distribution

V2 458-distribution-map.gif

Alta., B.C., Alaska, Ariz., Calif., Colo., Idaho, Mont., Nev., N.Mex., Oreg., S.Dak., Tex., Utah, Wash., Wyo., Mexico in Baja California, Chihuahua, and Durango

Discussion

Selected References

None.

Lower Taxa

None.
Carol A. Jacobs +  and James H. Peck +
L. Underwood +
distinct +
Pteris aquilina var. pubescens +
1-pinnate;decompound +
30 cm300 mm <br />0.3 m <br /> (200 cm2,000 mm <br />2 m <br />) +
glabrous +  and hairy +
ovate-triangular;nearly pentagonal 3-pinnate +
papery;leathery +
15 cm150 mm <br />0.15 m <br /> (100 cm1,000 mm <br />1 m <br />) +
Western bracken +
Alta. +, B.C. +, Alaska +, Ariz. +, Calif. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, S.Dak. +, Tex. +, Utah +, Wash. +, Wyo. +, Mexico in Baja California +, Chihuahua +  and and Durango +
0–3000 m +
In dry to moist woods and open areas in partial to full sun, forming abundant colonies +
pale +  and dark +
fused +  and free +
monomorphic +
deltate +
50 cm500 mm <br />0.5 m <br /> (450 cm4,500 mm <br />4.5 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
glabrous +  and short-hairy +
10 cm100 mm <br />0.1 m <br /> (100 cm1,000 mm <br />1 m <br />) +
Native Ferns ed. 6 +
Illustrated +
tetrahedral-globose +
granulate +
branching +  and solenostelic +
subterranean +
slender +
Pteridium aquilinum var. pubescens +
Pteridium aquilinum +
variety +
o--shaped +  and u +
forking +  and pinnate +
joined +  and free +
2-3-forked +