Woodsia alpina

(Bolton) Gray

Nat. Arr. Brit. Pl. 2: 17. 1822.

Common names: Alpine cliff fern woodsie alpine
Basionym: Acrostichum alpinum Bolton Fil. Brit. 2: 76, plate 42. 1790
Synonyms: Woodsia alpina var. bellii Lawson Woodsia bellii (Liljeblad) R. Brown Woodsia hyperborea (Linnaeus) R. Brown Woodsia ilvensis var. alpina (Bolton) Watt
Treatment appears in FNA Volume 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.

Phenology: Sporulating summer–early fall.
Habitat: Crevices and ledges on cliffs (occasionally on rocky slopes), mostly slaty and calcareous rocks
Elevation: 0–1500 m


V2 48-distribution-map.gif

Greenland, B.C., Man., N.B., Nfld. and Labr., N.W.T., N.S., Nunavut, 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 2n = 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.

Selected References


Lower Taxa

... more about "Woodsia alpina"
Michael D. Windham +
(Bolton) Gray +
Acrostichum alpinum +
Alpine cliff fern +  and woodsie alpine +
Greenland +, B.C. +, Man. +, N.B. +, Nfld. and Labr. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Maine +, Mich. +, Minn. +, N.H. +, N.Y. +, Vt. +  and n Eurasia. +
0–1500 m +
Crevices and ledges on cliffs (occasionally on rocky slopes), mostly slaty and calcareous rocks +
Sporulating summer–early fall. +
Nat. Arr. Brit. Pl. +
Woodsia alpina var. bellii +, Woodsia bellii +, Woodsia hyperborea +  and Woodsia ilvensis var. alpina +
Woodsia alpina +
species +