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Onostrobus elongatus
Onostrobus elongatus G.W. Rothwell, Stockey Foss. Impr., 90(1): 3. 18 Nov 2024
- Name
- Onostrobus elongatus
- Rank
- Species
- Generic Name
- [Genus] Onostrobus
- Authors (Pub.)
- Rothwell G. W.
Stockey R. A.
- Publication
- Pinaceous evolution illuminated by additional diversity of Early Cretaceous seed cones [2024/11]
- Journal
- Fossil Imprint
- Volume
- 90
- Issue
- 1
- Page number
- 3
- Year
- 2024
- Fossil Status
- cones (ovuliferous)
- Stratigraphy
- Aptian
- Strat. comment
- Upper Chickabally Member, Budden Canyon Formation
- Location
- Streambed in the southwest corner of Section 12, T30N, R7W of the Ono Quadrangle, a short distance from the town of Ono, California, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- California Academy of Sciences, San Francisco, USA
- Repository Number
- CASG 3,888
- Diagnosis
- 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.
