Trochodendron postnastae Manchester, Pigg et DeVore

Plant Fossil Names Registry Number: PFN000103

Act LSID: urn:lsid:plantfossilnames.org:act:103

Authors: S. R. Manchester, K. B. Pigg & M. L. DeVore

Rank: species

Reference: Manchester, S. R., Pigg, K. B. & DeVore, M. L. (2018): Trochodendraceous fruits and foliage in the Miocene of western North America. – Fossil Imprint 74(1–2): 45–54.

Page of description: 50

Illustrations or figures: text-fig. 4a–f, h–j

Types

Original diagnosis/description

Leaves with stout petioles and elliptical laminae, with length/width ratio 1.9 to 2.7:1. Base of lamina acute to almost right-angle and apex acute. Margin finely serrate in apical 2/3 of lamina, entire with a fimbrial vein in the lower 1/3. Venation pinnate with moderately thick midvein; basally acrodromous with a pair of strongly ascendant basal secondary veins plus 3 to 5 additional pairs of secondaries arising in the upper 2/3 of the lamina. Secondaries arising at narrow angles from midvein, slightly curved, craspedodromous. Occasional agrophic/pectinal veins arising from the basal secondary veins. Intersecondary veins common. Tertiary and quaternary veins forming a quadrangular to polygonal mesh and with areoles having branched freely ending veinlets. Teeth simple, rounded to acute, glandular, principal vein entering upper side of tooth. Sinuses angular.

Etymology

This species is named in reference to the geologically older species, Trochodendron nastae, which it resembles except in having basally acrodromous rather than actinodromous veins.

Stratigraphy

Neogene, Miocene
Middle Miocene
Type horizon: Little Butte Volcanics Series

Locality

United States
Moose Mountain near Cascadia, Oregon