Trochodendron postnastae Manchester, Pigg et DeVore
Plant Fossil Names Registry Number: PFN000103
Act LSID: urn:lsid:plantfossilnames.org:act:103
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
Holotype UCMP 201235, University of California Museum of Paleontology, Berkeley, USA
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.
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.
Type horizon: Little Butte Volcanics Series
Moose Mountain near Cascadia, Oregon
Plant fossil remain
macro- and meso-fossils-embryophytes except wood