(C) The genus $Nostoc$ was named by the Swedish botanist $Vaucher$ in $1803$. The name is derived from a term used by the alchemist $Paracelsus$ to de

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(C) The genus $Nostoc$ was named by the Swedish botanist $Vaucher$ in $1803$. The name is derived from a term used by the alchemist $Paracelsus$ to describe a gelatinous substance,but in the context of botanical nomenclature,$Vaucher$ is credited with the formal naming of the genus.