A class of objects divided into several subordinate species; a class more extensive than a species; a precisely defined and exactly divided class; one of the five predicable conceptions, or sorts of terms.
An assemblage of species, having so many fundamental points of structure in common, that in the judgment of competent scientists, they may receive a common substantive name. A genus is not necessarily the lowest definable group of species, for it may often be divided into several subgenera. In proportion as its definition is exact, it is natural genus; if its definition can not be made clear, it is more or less an artificial genus.
To use the same words is not a sufficient guarantee of understanding; one must use the same words for the same genus of inward experience; ultimately one must have one's experiences in common. Friedrich Nietzsche
Of all mushrooms commonly consumed, oyster mushrooms in the genus Pleurotus stand out as exceptional allies for improving human and environmental health. These mushrooms enjoy a terrific reputation as the easiest to cultivate, richly nutritious and medicinally supportive. Paul Stamets
Producer's Surplus is a convenient name for the genus of which the rent of land is the leading species. Alfred Marshall
The genus Drosophila is one of the great success stories. There's hundreds of species within the genus. They're on every continent except Antarctica, they're in tropical rain forests, they're in deserts, they've evolved many exotic mating behaviors, and they're capable of incredibly long-distance flights. Michael Dickinson