spore septum (noun, ascospore term,spore morphology term, pl. spore septa) – a spore wall that divides a spore cell into several new cells, either formed by both the endospore and the proper spore wall (proper septum) or by the endospore (endospore septum) alone. Related terms: early septum formation, late septum formation. This is:part of spore. See also thepart-of categorization:part of spore septum.