Not that any of the department's reasoning exists in tangible statute.
Where do I pay?
Oregon Designates Official State Microbe (Lowering the Bar)
... Oregon's official microbe is now Saccharomyces cerevisia, also known as "brewer's yeast." As one witness at the committee hearing put it, "[t]his great little microbe is probably responsible for the civilization of mankind," given that there is some evidence that grain was first domesticated (and fermented with yeast) so humans could get drunk, not so they could feed themselves.