Both density and arrangement of pits are highly variable, with some spores having few and others having many.
Layers separate somewhat in most crushed spores.
Consisting of two adherent hyaline layers. Mostly globose to subglobose, occasionally irregular. This orb is difficult to see except in older spores where contents have cleared with fusion of lipid globules in the spore lumen. Infection units appear to be patchily distributed with oblong to irregular vesicles often forming in small clusters. All mycorrhizal structures in corn roots.