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Landonia
Genus Landonia Upchurch, Dilcher Bull. U.S. Geol. Surv., (1915): 18. Dec 1990
- Name
- Landonia
- Rank
- Genus
- Authors (Pub.)
- Upchurch G. R., Jr.
Dilcher D. L.
- Publication
- Cenomanian angiosperm leaf megafossils, Dakota Formation, Rose Creek locality, Jefferson County, southeastern Nebraska [1990/12]
- Journal
- Bulletin of the United States Geological Survey
- Issue
- 1915
- Page number
- 18
- Year
- 1990
- Parent Taxon
- [Class] Magnoliopsida
- Fossil Status
- leaves
- Type
- Landonia calophylla
- Diagnosis
- Leaf oblong; base decurrent; margin
with mechanical reinforcement. Primary vein stout, multistranded.
Secondary venation festooned brochidodromous,
with the basalmost pairs of secondary veins closely
spaced and the superadjacent pairs wider apart;
secondary veins originating at broad acute or higher angles, tending toward sinuous; intercostal regions
roughly isodiametric above the basalmost few centimeters
of the leaf. Intercostal tertiary venation reticulate,
consisting of thick, roughly transverse veins that give rise
to somewhat thinner, admedially oriented lateral
branches. Excostal tertiary venation admedially ramified.
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