Plant creature that resembles shriekers, with branches that release rotting spores

Violet fungi looks like shriekers and in fact the two are often found growing together. The plants are usually 4-ft to 7-ft tall, and each plant has 1d4 branches growing out if it. At 4-ft tall, the fungi will have 1-ft branches. For every foot taller the fungi grows, the branches grow a foot longer. When the fungi detects movement nearby it will wave its branches around releasing its spores. Anyone within 4-ft will have to save vs poison or their exposed flesh will begin to rot within 1 round. Anyone who fails their save will require a cure disease spell.