Black Rot

History in brief
A horrid smelling fungus that often accumulates in dark, moist environments. It is often seen as a plague on any greenhouse plant grower, that being said it can also be used as a brilliant binding agent for potion making, cooking and general salves, balms and lotions.

Their appearance
It appears as a viscous dark black substance, that generally clings to rotting organic matter

What they smell like
It has a faint sweet smell to it, which often masks it among a bed of flowers.

Where are you most likely to encounter these
Any dark area that has organic mass for it to graft onto. The spores of this plant are widely available at most botanists.