Fungus, members of the plant kingdom that cannot make their own food using sunlight water and carbon dioxide. They need to grow on organic matter, either dead, as in those half circle brown things on downed birch trees, or alive, as with thrush, a fungal infection of inside your mouth.
But ya gotta love fungi (plural of fungus). Fungus makes alcohol as it's waste product and we get beer, wine and hard liquor.
I considered using "Juan Fun Guy" as my forum name, implying that i am fun and old (fungus).
This is likely more than you wanted to know. My initial plan in University was to be a botanist, hence i learned a bit about fungi.
kj, aka "juan fun guy"