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Aspidium aculeatum

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Name

Identification
Aspidium aculeatum Sw. [family TECTARIACEAE ] Verified by Not on sheet, Polystichum aculeatum (L.) Roth. [family DRYOPTERIDACEAE ] (stored under name); Verified by Not on sheet, Polystichum aculeatum (L.) Roth. [family DRYOPTERIDACEAE ] Verified by Not on sheet,
Related name
  • Aspidium setosum
  • Polystichum moritzianum
  • Aspidium aculeatum
  • Polypodium montevidense
  • Polystichum platyphyllum
  • Aspidium rufobarbatum
  • Polystichum setosum
  • Polystichum platylepis
  • Polystichum squarrosum
  • Phegopteris platyphylla
  • Polystichum giganteum
  • Polystichum adiantoides
  • Polystichum microsorium
  • Polystichum scopulinum
  • Polystichum aculeatum
  • Polystichum ordinatum
  • Polystichum longecuspis
Common name
  • Rock sword fern, Flora of North America Vol. 2
  • polystic des rochers, Flora of North America Vol. 2

Flora

Entry for Polystichum scopulinum (D. C. Eaton) Maxon [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 scopulinum (D. C. Eaton) Maxon [family DRYOPTERIDACEAE], Fern Bull., 8: 29. 1900
Aspidium aculeatum (Linnaeus) Swartz var. scopulinum D. C. Eaton [family DRYOPTERIDACEAE], Ferns N. Amer., 2: 125. 1880
Polystichum mohrioides (Bory) C. Presl var. scopulinum (D. C. Eaton) Fernald [family DRYOPTERIDACEAE]
Treatment Author(s)
David H. Wagner
Information
Stems ascending. Leaves erect, 1--3(--5) dm; bulblets absent. Petiole 1/5--1/3 length of leaf, densely scaly but scales falling off distally; scales light brown, abruptly diminishing in size distally. Blade narrowly lanceolate, 1-pinnate-pinnatifid, base narrowed. Pinnae oblong-lanceolate, overlapping, folded inward and twisted horizontally, 1--3 cm; base oblique; margins serrulate with teeth curved inward; apex obtuse to cuspidate with subapical teeth smaller than apical tooth; microscales narrowly lanceolate, with stout projections, sparse, on abaxial surface only. Indusia entire-ciliate. Spores brown. 2 n = 164.
Altitude range
0--3500 m
Distribution
USA Ariz.USA Calif.USA Colo.USA IdahoUSA Mont.USA Nev.USA Oreg.USA UtahUSA Wash.USA Wyo.Canada B.C.Canada Nfld.Canada Que.
Discussion
Polystichum scopulinum is widely distributed in the United States west of the 110th meridian, where it occurs in sporadic, usually small populations. The species is abundant only on montane serpentine outcrops. The populations in Newfoundland and Quebec are dramatically disjunct.
Polystichum scopulinum is an allopolyploid, believed on morphologic grounds to be derived from P . imbricans × lemmonii (D. H. Wagner 1979). Based on putative hybridization between P . scopulinum and P . munitum (P. S. Soltis et al. 1989; W. H. Wagner Jr. 1973), however, P . munitum may also be involved. This hybrid is discussed under P . californicum .

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