Sponge-plant

Sponge-plants are a strange species of vegetation from the planet Spiridon. When approached, they spit a type of fluid that carries the spores of a parasitic fungus, which infects and spreads all over the bodies of the creatures it comes in contact with. It's not known whether the Sponge-plant and the fungus are in fact different life stages of the same species, or live in some symbiotic association.

Appearances

 * Doctor Who, season 10, Planet of the Daleks (1973)