Carlquistoxylon australe С.I.Nunes, Pujana, Escapa, Gandolfo et Cúneo

Plant Fossil Names Registry Number: PFN001545

Act LSID: urn:lsid:plantfossilnames.org:act:1545

Authors: C. I. Nunes, R. R. Pujana, I. H. Escapa, M. A. Gandolfo & N. R. Cúneo

Rank: species

Reference: Nunes, C. I., Pujana, R. R., Escapa, I. H., Gandolfo, M. A. & Cúneo, N. R. (2018): A new species of Carlquistoxylon from the Early Cretaceous of Patagonia (Chubut province, Argentina): the oldest record of angiosperm wood from South America. – IAWA Journal 39(4): 406–426.

Page of description: 411

Illustrations or figures: figs 2–13

Types

Original diagnosis/description

Growth rings boundaries indistinct. Vessels solitary and in radial multiples of 2–4, sometimes more; tangential diameter usually smaller than 100 μm; normally 30–80 vessels per mm2. Vessel-ray parenchyma pits opposite to scalariform, when opposite oval to horizontally elongated. Axial parenchyma absent. Rays 1–4 cells wide (uniseriate rays very rare), heterocellular, with procumbent and square cells mixed through the ray, upright cells occasionally present at the ray margin and throughout the ray.

Etymology

The specific epithet australe refers to the Southern Hemisphere provenance of the fossil.

Stratigraphy

Cretaceous, Lower Cretaceous, Albian
Cerro Castaño Member, Cerro Barcino Formation, Chubut Group, Late Albian (Early Cretaceous).

Locality

Argentina
“La Flecha Pb 1”, La Flecha ranch, Chubut province.