Observe the spores in side or face view.

Choose this state if: at least some spores have an obvious medial constriction, producing a concave outline on the middle portion on both sides of the spore, so that the outline is like a figure-of-eight. The basal portion of the figure-of-eight may be wider than the apical portion. If the spore is concave on one side only, see Spore shape (side and front): phaseoliform to allantoid.