Comments
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Inglês
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fornecido por eFloras
The diploid Polypodium amorphum is one of the progenitors of allotetraploid P . hesperium , and these two species are occasionally sympatric. Although P . amorphum can be mistaken for P . hesperium , consistent differences exist for separating these two species (see comments under P . hesperium ). Hybridization between P . amorphum and P . hesperium results in triploid individuals with misshapen spores (F. A. Lang 1971).
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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Inglês
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fornecido por eFloras
Stems often whitish pruinose, slender, to 6 mm diam., acrid-tasting; scales weakly bicolored, lanceolate, contorted distally, bases and margins light brown, sometimes with dark central stripe, margins often coarsely dentate. Leaves to 30 cm. Petiole slender, to 1.5 mm diam. Blade oblong to rarely deltate, pinnatifid, usually widest near middle, occasionally at or near base, to 4 cm wide, somewhat leathery; rachis sparsely scaly to glabrescent abaxially, glabrous adaxially; scales lanceolate-ovate, usually more than 6 cells wide. Segments oblong, less than 12 mm wide; margins entire to crenulate; apex rounded to broadly acute; midrib glabrous adaxially. Venation free. Sori midway between margin and midrib to nearly marginal, less than 3 mm diam., circular when immature. Sporangiasters present, usually less than 40 per sorus, heads covered with glandular hairs. Spores more than 58 µm, rugose to verrucose, surface projections less than 3 µm tall. 2 n = 74.
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Habitat
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fornecido por eFloras
Sporulating summer--fall. Cliffs and rocky slopes; usually on igneous substrates; 0--1800m.
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Synonym
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Inglês
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fornecido por eFloras
Polypodium montense F. A. Lang
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Polypodium amorphum
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Inglês
)
fornecido por wikipedia EN
Polypodium amorphum is a species of fern with the common name irregular polypody, which grows near the northwest coast of North America.[1]
Description
Polypodium amorphum grows from a creeping rhizome, usually creeping along rock crevices. The rhizome has light brown scales that darken with age. The leaves arise singly from the rhizome (not forming a centralized tuft) and are up to 30 cm but usually much shorter. The petiole is slender, to 1.5 mm diam. Leaf blades are oblong to rarely deltate, up to 4 cm wide, somewhat leathery. The rachis is sparsely scaly to glabrous. Pinnule margins are entire to crenulate, with the apex rounded to broadly acute. The leaflets are usually shorter and more rounded than other Polypodium ferns that share its range. Sori are usually apparent from the top of the leaflets as bump-like protrusions. On the leaf underside, sori are midway between pinnule margin and midrib to nearly marginal, less than 3 mm in diameter, circular when immature. Sporangiasters with abundant glands are present nestled among the sporangia in spring and early summer, but are very small and can be seen only with close inspection with magnification. Polypodium amorphum differs from the similar Polypodium hesperium in having leaves that persist for two years and in the presence of sporangiasters.[2]
Range
This fern is native to the Pacific Northwest of North America, ranging from southern British Columbia to northern Oregon. It grows in the Olympics and on both sides of the Cascade crest, but on the drier (east) side only in damper spots at high elevation.[2][3]
Habitat
Polypodium amorphum grows mostly in moist rock crevices in mountains up to the subalpine zone.[2]
Taxonomy
References
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Polypodium amorphum: Brief Summary
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Inglês
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fornecido por wikipedia EN
Polypodium amorphum is a species of fern with the common name irregular polypody, which grows near the northwest coast of North America.
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- Wikipedia authors and editors
Polypodium amorphum
(
Vietnamita
)
fornecido por wikipedia VI
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Polypodium amorphum: Brief Summary
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Vietnamita
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fornecido por wikipedia VI
Polypodium amorphum là một loài thực vật có mạch trong họ Polypodiaceae. Loài này được Suksd. miêu tả khoa học đầu tiên năm 1927.
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- Wikipedia tác giả và biên tập viên
