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Liriodendrites bradacii
Liriodendrites bradacii K.R. Johnson Proc. Denver Mus. Nat. Hist., Series 3, (12): 3. 1 Apr 1996
- Name
- Liriodendrites bradacii
- Rank
- Species
- Generic Name
- [Genus] Liriodendrites
- Authors (Pub.)
- Johnson K. R.
- Publication
- Description of seven common fossil leaf species from the Hell Creek Formation (Upper Cretaceous: Upper Maastrichtian) North Dakota, South Dakota, Montana [1996/4]
- Journal
- Proceedings of the Denver Museum of Natural History
- Annee/Jahrgang
- Series 3
- Issue
- 12
- Page number
- 3
- Year
- 1996
- Fossil Status
- leaves
- Stratigraphy
- Maastrichtian
- Strat. comment
- Hell Creek Formation
- Location
- Slope County, North Dakota, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- Denver Museum of Nature and Science, DMNH, Denver, USA
- Repository Number
- DMNH 7329
- Diagnosis
- Bilobed leaf with deeply emarginate apex;
length: 4—13 cm, average length: 8.3 cm; width: 5—11 cm,
average width: 8.5 cm; l:w ratio: 1:1 (n=28); apical lobes
rounded, rarely bilobed (Fig. 7); base truncate to rounded,
rarely acute or cordate; margin entire and rarely undulate;
petiole normal. Venation pinnate, primary vein extending
to base of central sinus. Apical sinus variable in shape from
angular (common) to rounded (rare) and usually extending
for half the length of the leaf; lobes defining an area
ranging in shape from oval to triangular. Secondary venation
brochidodromous; 2—6 pairs of secondary veins; lowest
pair at high angles (60°); upper secondaries (45°); basal
secondaries with exmedial, lateral, brochidodromous secondaries,
giving the leaf base a square, truncate shape;
apical secondary usually giving rise to one or two admedial
lateral secondaries; intersecondaries present but rare; tertiaries
percurrent to reticulate, slightly arched toward the
apex; quaternaries orthogonal, perpendicular to tertiaries;
quinternaries orthogonal.
