If an infected enemy is being damaged by a Toxin proc, popping a spore on that enemy will also spread Toxin damage to surrounding enemies. If a spore is popped, 25 Viral damage with a 100% status chance is dealt within 8 / 10 / 12 / 16 meters, and 2 / 2 / 3 / 3 spores are transmitted to each affected enemy. Each spore inflicts 4 / 10 / 14 / 20 Viral damage per second over a duration of 6 / 8 / 10 / 12 seconds.
Saryn infects a target within 30 / 40 / 50 / 60 meters with 2 / 2 / 3 / 3 virulent spores.
I also suggest Regenerative Molt, Steel Fiber and Vitality. Now you don't want to go negative or to much into the negative (90% is as low as you want to go in anything) on any of her others stats, but they really don't warrant that much attention. There is only one stat that matters when building a spore build Saryn, and that is range. So I will do my best to break down everything you need to know about Saryn.
It would seem that there has been multiple people asking about Saryn, her weapons and how to mod everything.