THREE CRETACEOUS WOODS FROM THE CANADIAN ARCTIC
The structure is described for three new species of coniferous woods from Cretaceous formations in the Canadian Arctic which differ in various features from fossil woods previously recorded. Cedroxylon disjunctum sp. nov. is distinguished by gaps in cell continuity in the marginal rows of the xylem...
| Published in: | Canadian Journal of Botany |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Canadian Science Publishing
1957
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1139/b57-030 http://www.nrcresearchpress.com/doi/pdf/10.1139/b57-030 |
| Summary: | The structure is described for three new species of coniferous woods from Cretaceous formations in the Canadian Arctic which differ in various features from fossil woods previously recorded. Cedroxylon disjunctum sp. nov. is distinguished by gaps in cell continuity in the marginal rows of the xylem rays, a characteristic not hitherto described for Cedroxylon but found in living conifers such as Abies and Keteleeria. The two Piceoxylon woods possess resin ducts devoid of tylosoids, the ducts in Piceoxylon christopheri sp. nov. having an epithelium which consists entirely of thick-walled, pitted cells, whereas in P. thomsoni sp. nov. the walls of the epithelial cells vary from slightly to moderately thickened. |
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