Woodsia alpina
alpine cliff fern, alpine woodsia, northern cliff fern, woodsie alpine
compact, erect to ascending, with cluster of persistent petiole bases of ± equal length;
scales uniformly brown, lanceolate.
2.5–20 × 0.5–2.5 cm.
reddish brown or dark purple when mature, articulate above base at swollen node, relatively brittle and easily shattered.
linear to narrowly lanceolate, usually pinnate-pinnatifid proximally, lacking glands, never viscid;
rachis with widely scattered hairs and scales.
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.
of narrow, hairlike segments, these uniseriate throughout, composed of cells many times longer than wide, usually surpassing mature sporangia.
averaging 46–53 µm.
entire or broadly crenate;
margins nonlustrous, thin, with occasional isolated cilia, lacking translucent projections.
tips often enlarged to form whitish hydathodes visible adaxially.
Woodsia alpina
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.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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