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Ulminium pattersonensis

Angiospermae - Laurales - Lauraceae

Taxonomy
Ulminium pattersonensis was named by Page (1967). It is considered to be a form taxon. Its type specimen is Stanford University Paleontology Type Collection 6867 and is a 3D body fossil. Its type locality is Black Gulch, which is in a Maastrichtian marine horizon in the Panoche Formation of California.

Synonymy list
YearName and author
1967Ulminium pattersonensis Page p. 511 figs. 1-3, 7

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RankNameAuthor
kingdomPlantae
phylumSpermatophyta
classAngiospermae
Mesangiosperms
Magnoliid
RankNameAuthor
orderLauralesJussieu 1820
familyLauraceaeJussieu 1789
genusUlminiumUnger 1842
speciespattersonensis

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.

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Diagnosis
ReferenceDiagnosis
V. M. Page 1967Small branch, 2 cm in diam. Pith present, rectangular, composed of thin-walled, cells of varying sizes, some containing dark substance. Growth rings crowded and narrow at periphery of cross section, but discernible only with a microscope. Pores diffuse in radial multiples of 2-5 (mostly 3 or 4), some solitary and some in clusters; tangential diameter avg 106 μ (82-116 μ.) ; radial diameter avg 120 μ. (82-145μ.); flattened at contact with other vessels. Vessel elements avg 420 μ. in length (261-522 μ); pits crowded, alternate; perforation plates simple; tyloses thin-walled. .Axial parenchyma sparse, vasicentric; pits to vessels large to almost scalariform. Fibers make up mass of ground tis- sue, thin-walled, sporadically septate. Rays nar- row, 2-3 cells wide with multiseriate portion of procumbent cells, and uniseriate margins of up- right cells 1-4 cells high. Multiseriates from 144 μ. to 1 mm high; vestiges of brown substance in some cells; uniseriates scarce, composed of up- right cells; ray-vessel pits large; inflated cells with orange contents occur in some rays.