Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America
A quantitative and qualitative analysis of Climacium americanum and C. dendroides in North America confirms that these two taxa are distinct, although there is limited morphological intergradation in the region of the Great Lakes eastward to the coast. Climacium americanum has branch leaf upper cell...
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1976
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crcansciencepubl:10.1139/b76-202 2023-12-17T10:30:36+01:00 Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America Horton, Diana G. Vitt, Dale H. 1976 http://dx.doi.org/10.1139/b76-202 http://www.nrcresearchpress.com/doi/pdf/10.1139/b76-202 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 54, issue 16, page 1872-1883 ISSN 0008-4026 Plant Science journal-article 1976 crcansciencepubl https://doi.org/10.1139/b76-202 2023-11-19T13:39:20Z A quantitative and qualitative analysis of Climacium americanum and C. dendroides in North America confirms that these two taxa are distinct, although there is limited morphological intergradation in the region of the Great Lakes eastward to the coast. Climacium americanum has branch leaf upper cell length-to-width ratios of 3–7(8): 1, branch leaf auricles generally larger, stem leaf apices acuminate, and capsules symmetric, 3.0–6.0 mm long; while C. dendroides has branch leaf upper cell length to width ratios of (6)7–13:1, branch leaf auricles generally smaller, stem leaf apices obtuse and apiculate, and capsules usually asymmetric, 1.5–4.0 mm long. Climacium americanum is endemic to southeastern North America, while C. dendroides is western and boreal in distribution. It is hypothesized that the endemic C. americanum arose in isolation from the circumboreal C. dendroides. Upon retreat of Pleistocene glaciers, geographical intermingling of the two species resulted in limited morphological intergradation in southeastern Canada and northeastern United States. Climacium kindbergii is considered to be taxonomically synonymous with C. americanum, while C. novae-seelandiae is regarded as taxonomically synonymous with C. dendroides. Climacium japonicum is a distinct species characterized by a few large teeth on the abaxial surface of the costa of branch leaves. Article in Journal/Newspaper glacier* Canadian Science Publishing (via Crossref) Canada Canadian Journal of Botany 54 16 1872 1883 |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Plant Science |
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Plant Science Horton, Diana G. Vitt, Dale H. Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America |
topic_facet |
Plant Science |
description |
A quantitative and qualitative analysis of Climacium americanum and C. dendroides in North America confirms that these two taxa are distinct, although there is limited morphological intergradation in the region of the Great Lakes eastward to the coast. Climacium americanum has branch leaf upper cell length-to-width ratios of 3–7(8): 1, branch leaf auricles generally larger, stem leaf apices acuminate, and capsules symmetric, 3.0–6.0 mm long; while C. dendroides has branch leaf upper cell length to width ratios of (6)7–13:1, branch leaf auricles generally smaller, stem leaf apices obtuse and apiculate, and capsules usually asymmetric, 1.5–4.0 mm long. Climacium americanum is endemic to southeastern North America, while C. dendroides is western and boreal in distribution. It is hypothesized that the endemic C. americanum arose in isolation from the circumboreal C. dendroides. Upon retreat of Pleistocene glaciers, geographical intermingling of the two species resulted in limited morphological intergradation in southeastern Canada and northeastern United States. Climacium kindbergii is considered to be taxonomically synonymous with C. americanum, while C. novae-seelandiae is regarded as taxonomically synonymous with C. dendroides. Climacium japonicum is a distinct species characterized by a few large teeth on the abaxial surface of the costa of branch leaves. |
format |
Article in Journal/Newspaper |
author |
Horton, Diana G. Vitt, Dale H. |
author_facet |
Horton, Diana G. Vitt, Dale H. |
author_sort |
Horton, Diana G. |
title |
Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America |
title_short |
Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America |
title_full |
Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America |
title_fullStr |
Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America |
title_full_unstemmed |
Morphological characters, relative to distribution, and taxonomic considerations of the genus Climacium in North America |
title_sort |
morphological characters, relative to distribution, and taxonomic considerations of the genus climacium in north america |
publisher |
Canadian Science Publishing |
publishDate |
1976 |
url |
http://dx.doi.org/10.1139/b76-202 http://www.nrcresearchpress.com/doi/pdf/10.1139/b76-202 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
glacier* |
genre_facet |
glacier* |
op_source |
Canadian Journal of Botany volume 54, issue 16, page 1872-1883 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b76-202 |
container_title |
Canadian Journal of Botany |
container_volume |
54 |
container_issue |
16 |
container_start_page |
1872 |
op_container_end_page |
1883 |
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1785583584277430272 |