 When there are two or more cross-walls, the classification depends on spore shape.If the septae are "transversal", like the rungs of a ladder, it is a "phragmospore", and if they possess a net-like structure it is a "dictyospore".In "staurospores" ray-like arms radiate from a central body; in others ("helicospores") the entire spore is wound up in a spiral like a spring.