There are many living things that produce biological toxins but cyanobacteria, known to many as blue-green algae, may be the singular celled kings (or queens) of the poison game. Often times when toxics are associated with more complex life forms, there is a single-celled poison producer involved. The following article reveals the relationship between cyanobacteria and fungus (OK so not all that complex) better known as lichens – some of which are quite toxic. For more see the Surprisingly toxic world of the lichens, published on Discover Magazine’s blog, Not Exactly Rocket Science.
Lichen liking toxins