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Polystichum lachenense (Hook.) Bedd.   (redirected from: Polystichum aleuticum C. Christ.)
Family: Dryopteridaceae
[Aspidium lachenense Hook., morePolystichum aleuticum C. Christ., Polystichum sinkiangense Ching ex C.Y. Yang, Polystichum tsuchuense Ching]
Polystichum lachenense image
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David H. Wagner in Flora of North America (vol. 2)
Stems erect. Leaves monomorphic, erect, 1--1.5 dm; bulblets absent. Petiole 1/6--1/4 length of leaf; scales tan, sparse or falling off early. Blade linear-lanceolate, 1-pinnate, gradually tapered to base. Pinnae ± deltate to ovate, slightly overlapping, in 1 plane, 4--8 mm; base truncate, acroscopic auricle well developed; margins denticulate, not spiny; apex rounded, not dentate; microscales linear, lacking projections, dense on both surfaces. Indusia entire to minutely erose-dentate. Spores brown. Growing in crevices of rocks; of conservation concern; 0--400 m; Alaska. Polystichum aleuticum is known only from Atka and Adak islands, Alaska. Its nearest relatives are in southwest China. Polystichum aleuticum resembles the dwarfed plants of P . kruckebergii , but it differs, especially, in its smaller, more rounded pinna apices and more abundant scales.

Polystichum lachenense
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Polystichum lachenense image
Polystichum lachenense image
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Polystichum lachenense image
Polystichum lachenense image
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Polystichum lachenense image
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Polystichum lachenense image
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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.