Spirodela magna MacGinitie

Plant Fossil Names Registry Number: PFN001908

Act LSID: urn:lsid:plantfossilnames.org:act:1908

Author: H. D. MacGinitie

Rank: species

Reference: MacGinitie, H. D. (1974): An early Middle Eocene flora from the Yellowstone-Absaroka volcanic province, northwestern Wind River Basin, Wyoming. – University of California Publications in Geological Sciences 108: 1–103, 45 pls.

Page of description: 94

Illustrations or figures: pl. 6, fig. 4, pl. 21, fig. 4


Holotype PA 5617, University of California Museum of Paleontology, Berkeley, USA
Figures: pl. 6, fig. 4

Note: Paratype: PA 5686 (pl. 21, fig. 4 in MacGinitie 1974: Univ. Calif. Publ. Geol. Sci., 108).

Original diagnosis/description

"Leaves" orbicular, 1 to 1.5 cm. in diameter, seeming often to be paired, the pair consisting of a larger, orbicular lamina subtended at the base by a smaller (reproductive bud?), round or oblong form, 1 cm. in length by 5 mm. in width; venation numerous (1o to 14) unbranched veins, arising from the attachment point of the roots, ascending to the margin, the central vein nearly straight, but the veins progressively more curved toward the edge of the lamina until the outer veins are curved approximately parallel with the margin, the extremities of the veins strongly curved toward the center of the lamina, finally merging with the margin; between the veins is a complex, but even-textured network of veinlets, the areoles approximately 0.2 mm. in dimension; margin entire; texture firm, frequency common.


Paleogene, Eocene, Ypresian
upper volcaniclastic unit


United States
Kissinger Lakes, Wyoming

Plant fossil remain

macro- and meso-fossils-embryophytes except wood


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