The boletes of Michigan, by Alexander H. Smith and Harry D. Thiers.

Figs. 115-23: fig. 115, cuticular elements of Boletus caespitosus; fig. 116,
spores of same; fig. 117, pleurocystidia of same; fig. 118, spores of B. underwoodii; fig. 119, fascicle of trichodermial hyphae of same; fig. 120, spores of B.
multtfunctus; fig. 121, caulocystidia of Leccinum areolatum; fig. 122, cheilocystidia of Boletus multipunctus; fig. 123, cuticular elements of same.