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 | ||
| + | |rank=variety | ||
|publication_title=Bot. Tidsskr. | |publication_title=Bot. Tidsskr. | ||
|publication_place=20: 109. 1896 | |publication_place=20: 109. 1896 | ||
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|synonyms={{Treatment/ID/Synonym | |synonyms={{Treatment/ID/Synonym | ||
|name=Pogonatum sphaerothecium | |name=Pogonatum sphaerothecium | ||
| − | |authority= | + | |authority= |
| + | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Polytrichum sphaerothecium | |name=Polytrichum sphaerothecium | ||
| − | |authority= | + | |authority= |
| + | |rank=species | ||
}} | }} | ||
|hierarchy=Polytrichaceae;Polytrichastrum;Polytrichastrum sexangulare;Polytrichastrum sexangulare var. vulcanicum | |hierarchy=Polytrichaceae;Polytrichastrum;Polytrichastrum sexangulare;Polytrichastrum sexangulare var. vulcanicum | ||
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|elevation=high elevations | |elevation=high elevations | ||
|distribution=B.C.;Alaska;e Asia (Japan);Atlantic Islands (Iceland). | |distribution=B.C.;Alaska;e Asia (Japan);Atlantic Islands (Iceland). | ||
| − | |discussion=<p>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 < | + | |discussion=<p>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 <i></i>var.<i> sexangulare</i>. It is probably best considered a variety of <i>P. sexangulare</i>, 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 <i></i>var.<i> vulcanicum</i>.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Polytrichastrum sexangulare var. vulcanicum | name=Polytrichastrum sexangulare var. vulcanicum | ||
| − | |||
|authority=(C. E. O. Jensen) G. L. Smith | |authority=(C. E. O. Jensen) G. L. Smith | ||
|rank=variety | |rank=variety | ||
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|publication year= | |publication year= | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V27/V27_155.xml |
|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.