Polystichum microchlamys

(H. Christ) Matsumura

Index Pl. Jap. 1: 343. 1904.

Basionym: Aspidium microchlamys H. Christ Bull. Herb. Boissier 7: 820. 1899
Treatment appears in FNA Volume 2.

Stems erect. Leaves arching, 3–8 dm; bulblets absent. Petiole 1/8–1/4 length of leaf, densely scaly; scales brown, diminishing in size distally. Blade broadly lanceolate, 1-pinnate-pinnatifid, base slightly narrowed. Pinnae 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. Indusia erose-dentate. Spore color unknown.

Habitat: Terrestrial
Elevation: 0–100 m


V2 84-distribution-map.gif

Alaska, Asia in Kamtchatka and Japan.


Polystichum microchlamys is found in the flora only on Attu, at the western tip of the Aleutian Archipelago.

Selected References


Lower Taxa