Pier Antonio Micheli

Pier Antonio Micheli became one of the most important students of fungi of the early eighteenth century without the academic path typical of scholars of his time. He came from Florence and was largely self-taught. Through fieldwork, a knowledge of plants and the support of Tuscan naturalists he became associated with the botanical gardens in Florence and Pisa. The University of Florence today holds his manuscripts and material documenting his expeditions and extensive collections.

His most decisive work was microscopic observation of the reproductive structures of fungi. Micheli did not stop at noting that fruiting bodies carry a fine dust. He placed spores on prepared substrate and watched mycelium develop, along with fungi corresponding to the starting material. In an age when the origin of fungi was often explained by spontaneous generation from rotting matter, this was an experimental argument: a previously invisible stage of development could be tied to the later organism.

In Nova plantarum genera, published in 1729, he described and illustrated hundreds of fungi and other organisms then counted among the spore-bearing plants. The generic names he introduced, among them Aspergillus and Botrytis, have remained part of the language of biology, though their modern boundaries and relationships are established by entirely different methods. The book combined image, morphological characters and observation of development instead of treating fungi as irregular products of decay.

Micheli worked before the formalisation of modern nomenclature and before germ theory, so today's concepts should not be attributed to him. His significance lies in changing the way questions were asked: a fungus had structures of its own, a cycle and characters that could be compared. From that point mycology could develop as the study of organisms, rather than a catalogue of curiosities appearing after rain.

The surviving manuscripts matter as much as the printed book. They show that a result emerged through repeated observation, drawing and comparison of material from different expeditions. They allow a researcher today to separate a published claim from a working note, and to follow how the methods of early mycology took shape.

The archive reveals work too large for one book

The University of Florence Science Library describes the Fondo Micheli as 72 manuscripts comprising about 11,000 leaves, two volumes marked 29bis—the printed 1729 Nova plantarum genera and a set of proofs—and two general-index volumes. Roughly 1,300 sheets carry drawings attributed to Micheli himself, while about 2,500 colour plates were produced partly by Chellini and Bonechi. That distinction matters: “an illustration from the Micheli archive” does not always mean “drawn by Micheli’s hand.” The papers cover fungi, plants collected around Florence and field excursions; some are autographs and others scribal copies. Consultation and reproduction are possible with approval, but the archive is not loaned. A responsible visual module should therefore retain shelfmark, folio, draughtsperson and reproduction status rather than attach a generic Renaissance mushroom image.