This mold appears to be a result of psyllid activity. Black Sooty Molds are generally caused by a range of Ascomycete fungi. Stachybotrys chartarum is one possible scientific name. There is not just one species that is responsible for black sooty molds as it is a general term.
This type on yellow box gum Eucalyptus melliodora.
This sequence shows a few remaining lerps and the mold infestation that followed. It seems the lerps (shelters) are made of a sugary waxy substance and the psyllids (animals) which shelter in them also produce a sweet 'honeydew' which covers surfaces wherever they roam. The mold then grows on the honeydew. This explains why the lerps don't appear to be the centre of mold infestation but are always in the area. Black molds can be a very toxic and it is almost everywhere. Read more about mold sickness here... http://www.moldillness.org/Mold_Symptoms...