Fig. 186. Tuber cibarium.

A truffle (natural size) from which a slice has been cut to expose the internal structure.
A section of truffle (magnified). a. Cells. b c. Pedicellated peridiola or sporangia containing sporidia. d. A sporidium (or spore) more highly magnified.

This image is from Truffle in Pereira's Elements of Materia Medica and Therapeutics, 1854.