I've been recently experimenting with a variant of the Alga Reactum that creates trails in order to move. Actually, they worked better than expected. When placed in a confined space, most often the core of a plant cluster, they reproduce a little, and spread the virus to the nearby plants. They eventually enter an extremely unstable state in which they bounce around and knock all the infected plants out of the way. In addition, these "crawling plants" form geometrical structures with right angles and more, as well as circling around other creatures. I'm not sure whether or not to call it a plant or an animal, but it's good at spreading the virus.