Mostly globose, subglobose, ocasionally irregular. Sloughs on many spores, particularly those collected from the field or stored pot cultures. In almost all instances, however, these sublayers merge to become part of the spore wall.
Layers separate slightly in only a few spores, where they can be measured.
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. Arbuscules in cortical cells of corn roots All mycorrhizal structures in corn roots. Spore differentiation thus is thought to occur very quickly.