Polystichum imbricans |
Polystichum microchlamys |
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imbricate sword-fern, narrow-leaf sword fern, rock sword-fern |
attu hollyfern |
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Stems | ascending to erect. |
erect. |
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Leaves | erect to arching back at tip, 2–8 dm; bulblets absent. |
arching, 3–8 dm; bulblets absent. |
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Petiole | 1/4–1/3 length of leaf; scales abruptly diminishing in size distally and falling off early but retaining conspicuous tuft of brown scales at base. |
1/8–1/4 length of leaf, densely scaly; scales brown, diminishing in size distally. |
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Blade | linear-lanceolate to linear, 1-pinnate, base not or slightly narrowed. |
broadly lanceolate, 1-pinnate-pinnatifid, base slightly narrowed. |
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Pinnae | oblong, slenderly lanceolate, or falcate, usually overlapping, in 1 plane or twisted out of plane of blade, 2–4 cm; base oblique, auricles well developed; margins serrulate-spiny with teeth ascending; apex cuspidate or apiculate with subapical teeth smaller than apical tooth; microscales lanceolate to linear with straight or sharply angular projections, sparse, on abaxial surface only. |
narrowly lanceolate, not overlapping, in 1 plane, 3–13 cm; base oblique, proximal acroscopic segments enlarged; margins incised to costa but segments sessile and adnate to costa for at least 2 mm, segments excised and decurrent, serrulate-spiny with teeth spreading to ascending; apex acute with subapical and apical teeth same size; microscales filiform, dense abaxially, sparse adaxially. |
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Indusia | entire to sharply dentate. |
erose-dentate. |
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Spore(s) | dark brown. |
color unknown. |
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Polystichum imbricans |
Polystichum microchlamys |
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Habitat | Terrestrial | |||||
Elevation | 0–100 m (0–300 ft) | |||||
Distribution |
CA; OR; WA; BC; only in the flora
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AK; Asia in Kamtchatka and Japan |
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Discussion | Polystichum imbricans is one of the postulated ancestors of two allopolyploids, P. californicum and P. scopulinum (D. H. Wagner 1979). Relationships to P. munitum are discussed under that species. Subspecies 2. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Polystichum microchlamys is found in the flora only on Attu, at the western tip of the Aleutian Archipelago. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 2. | FNA vol. 2. | ||||
Parent taxa | Dryopteridaceae > Polystichum | Dryopteridaceae > Polystichum | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Aspidium munitum var. imbricans, P. munitum subsp. imbricans, P. munitum var. imbricans | Aspidium microchlamys | ||||
Name authority | (D. C. Eaton) D. H. Wagner: Pteridologia 1: 50. (1979) | (H. Christ) Matsumura: Index Pl. Jap. 1: 343. (1904) | ||||
Web links |
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