Onostrobus elongatus Rothwell et Stockey

Plant Fossil Names Registry Number: PFN003376

Act LSID: urn:lsid:plantfossilnames.org:act:3376

Authors: G. W. Rothwell & R. A. Stockey

Rank: species

Genus: Onostrobus Rothwell et Stockey

Reference: Rothwell, G. W. & Stockey, R. A. (2024): Pinaceous evolution illuminated by additional diversity of Early Cretaceous seed cones. – Fossil Imprint 80(1): 1–8.

Page of description: 3

Illustrations or figures: text-figs 1–3

Name is type for

Types

Original diagnosis/description

Cone more than 16.1 cm long and 2.1 cm wide, with thin, foliate cone scales. Axis with parenchymatous pith and secondary xylem cylinder lacking resin canals; axis stele dissected by divergence of xylem to bract/scale complexes. Bract/scale complex vasculature of three traces forming inverted U-shape in scale base, opening out into single plane to become straight; dividing into several strands in scale base. Bract with at least one accompanying resin canal; bract trace of few loosely arranged tracheids. Large, apparently lysigenous canals in cone axis; two canals abaxial to vasculature of each bract/scale complex. Scales with prominent abaxial and adaxial bands of hypodermal sclerenchyma; resin canals abaxial, adaxial and between vascular bundles in ovuliferous scale. Embryos with ca. 8–9 cotyledons.

Etymology

The specific epithet elongatus refers to the overall shape of the cone.

Stratigraphy

Cretaceous, Lower Cretaceous, Aptian
Upper Chickabally Member, Budden Canyon Formation; Bedoulian Stage

Locality

United States
Streambed located in the southwest corner of Section 12, T30N, R7W of the Ono Quadrangle, a short distance from the town of Ono California