The paper presents results of screening of microscopic fungi occurring
in groundwater, soil and air in selected localities of the small Danu
be island during the period of 1994-1995. Totally, 33 genera of microm
ycetes were isolated. From that number 10 genera occurred in all compo
nents of biosphere. A 100% occurrence in all samples was recorded only
in the genus Cladosporium. The representants of other micromycetic ge
nera were identified only in some localities and biotopes. Knowling th
is problem requires a long-term special interests to be paid to myceti
c revitalization of all biosphere components and their mutual relation
ships, because this shortterm observation could not have solved the pr
oblem.