Dendrology

North America is home to 91 species of oak trees. Astoundingly, the various species rarely, if ever, occur alone. Where one kind of oak is found, invariably at least one more will be found. How can nature support a setup like that when it operates on the principle that only the fittest survive in any one setting?

Illinois State Museum features dwarf chinkapin oak, discovered in Illinois during an IOS Tour, as part of the Illinois Bicentennial exhibition.

Plant pathologists from the California Department of Agriculture (CDFA) recently identified a new species of fungal pathogen that infects oak, chinkapins, and tanoaks. Until recently, North American diagnosticians called all species of the genus Tubakia that infects oaks in North America, Tubakia dryina, because they all have very similar morphological features to this European fungus. However, a new study shows that the North American species vary genetically from Tubakia dryina. Among these is the newly recognized California species.

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