View source for Polytrichastrum sexangulare var. vulcanicum

{{Treatment/ID
|accepted_name=Polytrichastrum sexangulare var. vulcanicum
|accepted_authority=(C. E. O. Jensen) G. L. Smith
|publications={{Treatment/Publication
|title=Bryologist
|place=95: 270. 1992,
}}
|basionyms={{Treatment/ID/Synonym
|name=Polytrichum sexangulare var. vulcanicum
|authority=C. E. O. Jensen
}}
|synonyms={{Treatment/ID/Synonym
|name=Pogonatum sphaerothecium
|authority=unknown
}}{{Treatment/ID/Synonym
|name=Polytrichum sphaerothecium
|authority=unknown
}}
|hierarchy=Polytrichaceae;Polytrichastrum;Polytrichastrum sexangulare;Polytrichastrum sexangulare var. vulcanicum
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polytrichaceae]]</div><div class="higher-taxon"><small>genus</small>[[Polytrichastrum]]</div><div class="higher-taxon"><small>species</small>[[Polytrichastrum sexangulare]]</div><div class="higher-taxon"><small>variety</small>[[Polytrichastrum sexangulare var. vulcanicum]]</div></div>
|volume=Volume 27
|mention_page=
|treatment_page=page 129
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>small, forming large brownish mats. <b>Stems</b> with 5–6 layers of thick-walled cortical cells. <b>Leaves</b> 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. <b>Seta</b> arcuate with age. <b>Capsule</b> nearly globose, horizontal to nodding; peristome teeth 32, short, attenuate, the alternate teeth often smaller.</span><!--

-->{{Treatment/Body
|habitat=Volcanic rocks
|elevation=high elevations
|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>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Polytrichastrum sexangulare var. vulcanicum
|author=
|authority=(C. E. O. Jensen) G. L. Smith
|rank=variety
|parent rank=species
|synonyms=Pogonatum sphaerothecium;Polytrichum sphaerothecium
|basionyms=Polytrichum sexangulare var. vulcanicum
|family=Polytrichaceae
|habitat=Volcanic rocks
|elevation=high elevations
|distribution=B.C.;Alaska;e Asia (Japan);Atlantic Islands (Iceland).
|reference=None
|publication title=Bryologist
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/coarse_grained_fna_xml/V27/V27_155.xml
|genus=Polytrichastrum
|species=Polytrichastrum sexangulare
|variety=Polytrichastrum sexangulare var. vulcanicum
}}<!--

-->[[Category:Treatment]][[Category:Polytrichastrum sexangulare]]