Compilation
Polystichum setigerum

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Name

Identification
Polystichum setigerum (C. Presl) C. Presl [family DRYOPTERIDACEAE ] (stored under name); Verified by Not on Sheet, Isotype of Polystichum alaskense Maxon [family DRYOPTERIDACEAE ] Verified by Not on Sheet,
Related name
  • Polystichum setigerum
  • Polystichum alaskense
Common name
  • Alaska sword fern, Flora of North America Vol. 2

Flora

Entry for Polystichum setigerum (C. Presl) C. Presl [family DRYOPTERIDACEAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 2,
Names
Polystichum setigerum (C. Presl) C. Presl [family DRYOPTERIDACEAE], Tent. Pterid., 83. 1836
Nephrodium setigerum C. Presl [family DRYOPTERIDACEAE], Reliq. Haenk., 1: 37. 1825
P. braunii (Spenner) Fée subsp. alaskense (Maxon) Calder & R. L. Taylor [family ]
P. braunii var. alaskense (Maxon) Hultén [family ]
Treatment Author(s)
David H. Wagner
Information
Stems erect. Leaves arching, 4--10 dm; bulblets absent. Petiole 1/8--1/5 length of leaf, densely scaly; scales light brown, gradually diminishing in size distally. Blade lanceolate, deeply 1-pinnate-pinnatifid to 2-pinnate, base narrowed. Pinnae lanceolate, not overlapping, in 1 plane, 4--8 cm, base oblique, margins incised to costa on middle pinnae, serrulate-spiny with teeth spreading-ascending, apex acute-apiculate with subapical and apical teeth same size; microscales filiform, sparse abaxially, confined to costa adaxially. Indusia erose-ciliate. Spores brown. 2 n = 246.
Altitude range
0--250 m
Distribution
USA Alaska.Canada B.C.
Discussion
Polystichum setigerum is disjunct on Attu Island at the western tip of the Aleutian Archipelago. It is presumed to be of hybrid origin, the result of a cross between P . munitum and P . braunii (D. H. Wagner 1979). This hybrid has been produced experimentally (A. Sleep and T. Reichstein 1967) and is reported from British Columbia (see discussion under P . braunii ).

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