Biseriate

Biseriate is a botanical term applied to both plantae and fungi, meaning 'arranged in two rows'.^[1]

The term can refer to any number of structures found within these kingdoms, from arrangement of leaves to the placement of spores.

It becomes useful in taxonomy for placing a species within a certain genus, family, or even order, based upon morphology, when making an initial choice or when DNA evidence is inconclusive.