Log In New Account Sitemap
  • Home
  • Search
    • Search Collections
    • Map Search
    • Dynamic Species List
    • Exsiccati
    • Taxonomic Explorer
  • Images
    • Image Browser
    • Search Images
  • Species Checklists
    • North America
  • Crowdsource
  • Contacts
    • Partners
  • Acknowledgements
Woodsia alpina (Bolton) Gray  
Family: Woodsiaceae
[Acrostichum alpinum Bolton, moreAcrostichum hyperboreum Liljebl., Ceterach alpinum (Bolton) DC., Polypodium arvonicum Wither., Polypodium hyperboreum (Lilj.) Sw., Trichocyclus hyperboreus Dulac, Woodsia alpina subsp. bellii (Lawson) A. & D. Löve, Woodsia alpina var. bellii G.Lawson, Woodsia bellii (Lawson) Porsild, Woodsia glabella var. bellii G.Lawson, Woodsia himalaica Ching & S. K. Wu, Woodsia hyperborea (Liljeblad) R. Br., Woodsia hyperborea var. arvonica (With.) Milde, Woodsia ilvensis subsp. alpina (Bolton) Ascherson, Woodsia ilvensis subsp. hyperborea (Lilj.) Hartm., Woodsia ilvensis var. alpina (Bolton) Watt]
Woodsia alpina image
  • FNA
  • Gleason & Cronquist
  • Resources
Michael D. Windham in Flora of North America (vol. 2)
Stems compact, erect to ascending, with cluster of persistent petiole bases of ± equal length; scales uniformly brown, lanceolate. Leaves 2.5--20 × 0.5--2.5 cm. Petiole reddish brown or dark purple when mature, articulate above base at swollen node, relatively brittle and easily shattered. Blade linear to narrowly lanceolate, usually pinnate-pinnatifid proximally, lacking glands, never viscid; rachis with widely scattered hairs and scales. Pinnae ovate-lanceolate to deltate, longer than wide, abruptly tapered to a rounded or broadly acute apex; largest pinnae with 1--3 pairs of pinnules; abaxial surface with isolated hairs and linear scales, adaxial surface glabrous. Pinnules entire or broadly crenate; margins nonlustrous, thin, with occasional isolated cilia, lacking translucent projections. Vein tips often enlarged to form whitish hydathodes visible adaxially . Indusia of narrow, hairlike segments, these uniseriate throughout, composed of cells many times longer than wide, usually surpassing mature sporangia. Spores averaging 46--53 µm. Sporulating summer--early fall. Crevices and ledges on cliffs (occasionally on rocky slopes); mostly slaty and calcareous rocks; 0--1500 m; Greenland; B.C., Man., N.B., Nfld., N.W.T., N.S., Ont., Que., Sask., Yukon; Alaska, Maine, Mich., Minn., N.H., N.Y., Vt.; n Eurasia. Isozyme studies confirm the longstanding hypothesis that Woodsia alpina is an allotetraploid derived from hybridization between W . glabella and W . ilvensis (see reticulogram). Considerable disagreement exists concerning the chromosome number of W . alpina , but 2 n = 160 seems most likely, given the numbers reported for the two parental species. Hybrids between W . alpina and W . ilvensis have been reported from both Europe and North America. These morphologically intermediate triploids with malformed spores have been called W . × gracilis (Lawson) Butters.

Vascular plants of NE US and adjacent Canada
Rhizome-scales lanceolate or lance-ovate, 4-6 נ1-2 mm, brown, denticulate, sparsely fimbriate; lvs 6-15 cm; petiole bright brown, sparingly scaly and hairy, articulate below the middle; blade linear, 1-2 cm wide, slightly narrowed below, pinnate-pinnatifid, sparsely hairy on the rachis and lower surface, the rachis also sparsely scaly; pinnae sessile, 8-15 pairs, ovate, obtuse, deeply pinnatifid, the segments 2-3(4) pairs, oblong to suborbicular, the lower sublobate, not ciliate; indusium a small disk with a few long septate marginal hairs; 2n=156, thought to be an alloploid derived from nos. 1 [Woodsia glabella R. Br.] and 3 [Woodsia ilvensis (L.) R. Br.]. Rock crevices in cool sites; circumboreal, s. to N.S., Vt., N.Y., Mich., and Minn. A sterile triploid hybrid with no. 3 [Woodsia ilvensis (L.) R. Br.] is W. اracilis (G. Lawson) Butters.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Woodsia alpina
Open Interactive Map
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Woodsia alpina image
Click to Display
100 Initial Images
- - - - -
View All Images

The PCC, and this data portal, were made possible by funding from the National Science Foundation’s Advancing Digitization of Biological Collections (ADBC) program, grant numbers 1802504, 1802352, 1802134, 1802033, 1802270, 1802255, 1802239, 1802446, 1802305.
The pteridoportal taxonomic thesaurus is based on the Checklist of Ferns and Lycophytes of the World, generously provided by Michael Hassler.