Difference between revisions of "Polytrichastrum sexangulare var. vulcanicum"
Bryologist 95: 270. 1992,.
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|name=Pogonatum sphaerothecium | |name=Pogonatum sphaerothecium | ||
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|name=Polytrichum sphaerothecium | |name=Polytrichum sphaerothecium | ||
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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 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.</p> | + | |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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| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V27/V27_155.xml |
|genus=Polytrichastrum | |genus=Polytrichastrum | ||
|species=Polytrichastrum sexangulare | |species=Polytrichastrum sexangulare | ||
Revision as of 17:53, 18 September 2019
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.