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Dicotylophyllum hebronense
Dicotylophyllum hebronense L.J. Hickey Mem. Geol. Soc. Amer., 150: 148. 19 Jul 1977
- Name
- Dicotylophyllum hebronense
- Rank
- Species
- Original spelling
- hebronensis
- Generic Name
- [Genus] Dicotylophyllum
- Authors (Pub.)
- Hickey L. J.
- Publication
- Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota [1977/7]
- Journal
- Memoirs of the Geological Society of America
- Volume
- 150
- Page number
- 148
- Year
- 1977
- Fossil Status
- leaves
- Stratigraphy
- Thanetian
- Location
- Western pit of the Hebron Brick Company, Morton County, North Dakota, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43703
- Diagnosis
- Leaf symmetrical; wide elliptic; l / w ratio 1.22; / 7.7 cm; w 6.3 cm; part in
the immediate vicinity of the apex missing but probably obtuse to rounded; base slightly cordate; margin distantly and shallowly dentate with glandular protuberances at the ends of the teeth; sinuses broad and rounded; texture probably subcoriaceous. Venation pinnate, brochidodromous, with the lower secondaries eucamptodromous; several strongly developed tertiary veins run from the secondary arch to the teeth; primary vein straight, thickness
moderate; secondaries originating at moderate angles (45° to 60°), except for the lowest two pairs that diverge at much higher angles; secondaries of moderate thickness, the upper ones slightly upcurved, the two lower pairs downcurved; loop-forming branch of the lower secondary joining the upper secondary at an acute angle. Intercostal tertiaries originating from both sides of the secondaries at acute angles, relatively thin, percurrent, convex, recurved near the midrib, roughly oblique to it, becoming more perpendicular apically. Fourth-order veins approximately orthogonal; the fifth order less so or random; vein orders higher than fifth, either not present or immersed in the leaf substance; highest order showing excurrent branching, fourth; features of the marginal ultimate veins not discernible; areolation equant
and pentagonal and from 0.7 to 1.2 mm in diameter.
