Difference between revisions of "Polytrichastrum sexangulare var. vulcanicum"
Bryologist 95: 270. 1992,.
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|name=Polytrichum sexangulare var. vulcanicum | |name=Polytrichum sexangulare var. vulcanicum | ||
|authority=C. E. O. Jensen | |authority=C. E. O. Jensen | ||
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| + | |publication_title=Bot. Tidsskr. | ||
| + | |publication_place=20: 109. 1896 | ||
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|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Pogonatum sphaerothecium | |name=Pogonatum sphaerothecium | ||
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|name=Polytrichum sphaerothecium | |name=Polytrichum sphaerothecium | ||
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|hierarchy=Polytrichaceae;Polytrichastrum;Polytrichastrum sexangulare;Polytrichastrum sexangulare var. vulcanicum | |hierarchy=Polytrichaceae;Polytrichastrum;Polytrichastrum sexangulare;Polytrichastrum sexangulare var. vulcanicum | ||
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name=Polytrichastrum sexangulare var. vulcanicum | name=Polytrichastrum sexangulare var. vulcanicum | ||
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|authority=(C. E. O. Jensen) G. L. Smith | |authority=(C. E. O. Jensen) G. L. Smith | ||
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|genus=Polytrichastrum | |genus=Polytrichastrum | ||
|species=Polytrichastrum sexangulare | |species=Polytrichastrum sexangulare | ||
Latest revision as of 21:24, 5 November 2020
Plants small, forming large brownish mats. Stems with 5–6 layers of thick-walled cortical cells. Leaves incurved and closely appressed to the stem when dry, erect-spreading when moist; sheath poorly delimited; marginal lamina expanded and involute, covering the lamellae; perichaetial leaves abruptly narrowed to the blade. Seta arcuate with age. Capsule nearly globose, horizontal to nodding; peristome teeth 32, short, attenuate, the alternate teeth often smaller.
Habitat: Volcanic rocks
Elevation: high elevations
Distribution
B.C., Alaska, e Asia (Japan), Atlantic Islands (Iceland).
Discussion
Variety vulcanicum is notable for the rather thick, curved seta, nodding, globose capsule, and the stem cortex composed of very thick-walled cells, in contrast to the thin-walled cortex of var. sexangulare. It is probably best considered a variety of P. sexangulare, despite its distinctive peristome and the absence of capsule angles. E. Lawton (1971) described intermediate forms in British Columbia with acute-tipped leaves and angled capsules, but with the stem cortical cells and peristome of var. vulcanicum.
Selected References
None.