Mould

Image: Plate 12 (Schem. XII), between pp. 124-125 (Observation 20 Of blue Mould and of the first Principles of Vegetation arising from Putrefaction of a Plant growing in the blighted or yellow specks of Damask-rose-leaves, Bramble-leaves, and some other kind of leaves). Robert Hooke, Micrographia: or, Some physiological descriptions of minute bodies made by magnifying glasses. London: J. Martyn and J. Allestry, 1665. Dimensions: the larger, circular images ic c. 170 mm in diameter. Source: National Library of Wales via Wikimedia (public domain).