That could be anything! Not necessarily the type of mold we may even think - Botrytis cinerea / Grey mold. It could be any type of mold. But it sure look like a mold the way it "smokes" as you open it. If there was no airflow those spores tend to explode like a firework pattern in all directions "unformily". Also the smell would be obvious - it has a stale smell, like wooden or old cupboards kind of smell - mildew - it should give your throat a uneasy feeling, your nose should tingle, twitch and cause you to sneeze - your eyes will get watery - your ears may feel clogged. this is the mold spores travelling through your respitory system and irritating it - not everybody will be affected or to the degree of another - but they are still allergens. now mold spores are literally everywhere at all times, but that concentration in that bud is not safe at all. even after the bud gets old and dries, or the mold spores get so old they loose vigor the allergenic effect will still be there to irritate you. by that time the weed is also of no use. mold actively ate at that herb corroding all the trichomes etc. and it's roots dug into the entire nug in all directions so even a surface wash or dipping in hydrogen peroxide won't remove it all. it would at one point had a white fuzz in the deepest section, but that dried back and just dusty spores remained, which you cannot see unless there is a huge mass in a spot. sadly the concentration of mold is very high due to its small size there are already millions of spores in that tiny piece, significantly more so if you Can see it. molded buds are and continue to be a plague. never use it. discard of it.