sample taken, grown up in the lab, inspected by 2 mocrobiologists
it's called Cladosporium (genus) herberum (species)(possibly)
harmless unless breathed in.
more worrying was the discovery of gram negative rods, a bacteria which is probably pseudomonas species, a common water bourne organism, which could possibly cause eye irritations.
upshot: wash yer drawers !
hth
RT