White weed

The White Weed is a yellowish fungus that was introduced to Mars in an attempt to terraform the planet. It managed to thicken the air with carbon dioxide but produced little oxygen. 
The weed grows extremely fast when given materials it can ingest, so fast that if one were to walk over it barefoot it would grow into their feet and digest them within an hour.
== Behind the Scenes ==
The concept of Mars being covered in a yellow fungus was invented by Edgar Rice Burroughs for his Mars series.Category:Technology