Magnified at 100x, this 1971 photomicrograph depicted a mass known as a sclerotium
that had been sloughed from the surface of a colony of the fungus Penicillium sclerotiorum
. Sometimes referred to as sclerotic bodies
, these structures act as mechanisms of regeneration, and are composed of a hard, environmentally-resistant mass of heterogeneous fungal tissues that are able, under favorable conditions, to germinate a new fungal colony.