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Ulmus columbiana
Taxonomy
Ulmus columbiana was named by Penhallow (1907). It is not extant. Its type specimen is 250/c, a wood. Its type locality is Kettle River , which is in an Eocene terrestrial shale in the Kettle River Formation of Canada.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1907 | Ulmus columbiana Penhallow |
| 1919 | Ulmus columbiana Knowlton |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Ulmus columbiana Penhallow 1907
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| Penhallow 1907 | Transverse -
Growth rings rather broad and well defined . Tracheids not very thick-walled, gradually passing into a thin and poorly defined limiting zone upwards of 8 tracheids thick. Medullary rays numerous, 1-4 cells wide, resinous, distant chiefly one but sometimes three rows of vessels. Vessels oval or round, more or less in radial rows, radially 1-5 seriate or sometimes tangentially 2 seriate; the larger vessels occupying a zone of variable width in the spring wood and often preceded by a series of smaller vessels, more or less abruptly diminishing and becoming more scattering toward the summer wood where they form more or less scattering groups or finally become merged with the wood parenchyma. Wood parenchyma very variable and often apparently wanting, but when prominent surrounding groups of vessels or forming isolated and commonly tangentially disposed tracts of variable size near the outer limits of the growth ring. Radial - Vessels short and commonly broad, the hexagonal, multiseriate pits with transverse slit-like pores. Medullary rays numerous and medium to rather high, the cells all of one kind though often much shortened; the upper and lower walls multiporous when contiguous to vessels. Vessels of the medullary sheath spiral and scalariform, the adjacent parenchyma filled with starch. Woo parenchyma cells about 8 times longer than broad. Tangential - Rays of two kinds ; the uniseriate rays low , inconspicuous, not numerous; the multiserate rays numerous, resinous, lenticular, upwards of 5 cells wide, the terminals not prolonged, the cells all of one kind and chiefly thin walled. |
Measurements
No measurements are available
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| Source: p = phylum | |||||
| Reference: Kiessling 2009 | |||||