Most spores extracted from active pot cultures are a very pale yellow.
Mostly globose, subglobose. At maturity, the spore detaches form the saccule and is sessile. It is essentially an 'endospore' in that it separates completely from the parent saccule neck and the spore wall has no break or opening in the region of attachment to the saccule neck. Infection units appear to be patchily distributed with oblong to irregular vesicles often forming in small clusters. It spanned most of the diameter of the spores, was circular with a simple inward spiral, with a smooth outer margin.