The chief condition in the existence of the blue mould is excessive moisture.
One is half inclined to look for a coating of blue mould over the streets and houses.
There was, indeed, danger of coming out covered with blue mould.
When ripe it is permeated by a blue mould, and resembles in flavour, appearance and consistency a rich old Stilton.
The walls are stained a delicate green tint relieved by a film of blue mould, owing to lack of a damp-course.
Another form, common everywhere on mouldy food of all kinds, as well as in other situations, is the blue mould (Penicillium).
Some of the varieties have a deep blue color, and a settlement of them looks very much like a patch of blue mould.
Through the negligence of the servant they have been hung up in a damp state, and had become covered with blue mould.